Removes links to non-existant files. Fixes #1563. (#1582) (#1583)

docs/serving/samples/README.md

@@ -8,15 +8,11 @@ Serving resources and how they can be applied across common use cases.
 | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
 | Hello World                | A quick introduction that highlights how to deploy an app using Knative Serving.                                                                                                                                         | [C#](./hello-world/helloworld-csharp/README.md), [Go](./hello-world/helloworld-go/README.md), [Java (Spark)](./hello-world/helloworld-java-spark/README.md), [Java (Spring)](./hello-world/helloworld-java-spring/README.md), [Kotlin](./hello-world/helloworld-kotlin/README.md), [Node.js](./hello-world/helloworld-nodejs/README.md), [PHP](./hello-world/helloworld-php/README.md), [Python](./hello-world/helloworld-python/README.md), [Ruby](./hello-world/helloworld-ruby/README.md), [Scala](./hello-world/helloworld-scala/README.md), [Shell](./hello-world/helloworld-shell/README.md) |
 | Advanced Deployment        | Simple blue/green-like application deployment pattern illustrating the process of updating a live application without dropping any traffic.                                                                              |                                                                                                                                                                                                                                                                                 [YAML](./blue-green-deployment.md)                                                                                                                                                                                                                                                                                 |
-| Autoscale                  | A demonstration of the autoscaling capabilities of Knative.                                                                                                                                                              |                                                                                                                                                                                                                                                                                   [Go](./autoscale-go/README.md)                                                                                                                                                                                                                                                                                   |
-| Private Repo Build         | An example of deploying a Knative Serving Service using a Github deploy-key and a DockerHub image pull secret.                                                                                                           |                                                                                                                                                                                                                                                                              [Go](./build-private-repo-go/README.md)                                                                                                                                                                                                                                                                               |
-| Buildpack for Applications | A sample app that demonstrates using Cloud Foundry buildpacks on Knative Serving.                                                                                                                                        |                                                                                                                                                                                                                                                                              [.NET](./buildpack-app-dotnet/README.md)                                                                                                                                                                                                                                                                              |
-| Buildpack for Functions    | A sample function that demonstrates using Cloud Foundry buildpacks on Knative Serving.                                                                                                                                   |                                                                                                                                                                                                                                                                          [Node.js](./buildpack-function-nodejs/README.md)                                                                                                                                                                                                                                                                          |
+| Autoscale                  | A demonstration of the autoscaling capabilities of Knative.                                                                                                                                                              |                                                                                                                                                                                                                                                                                   [Go](./autoscale-go/README.md)                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                               |                       |                                                  |
 | Github Webhook             | A simple webhook handler that demonstrates interacting with Github.                                                                                                                                                      |                                                                                                                                                                                                                                                                                  [Go](./gitwebhook-go/README.md)                                                                                                                                                                                                                                                                                   |
 | gRPC                       | A simple gRPC server.                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                   [Go](./grpc-ping-go/README.md)                                                                                                                                                                                                                                                                                   |
 | Knative Routing            | An example of mapping multiple Knative services to different paths under a single domain name using the Istio VirtualService concept.                                                                                    |                                                                                                                                                                                                                                                                                [Go](./knative-routing-go/README.md)                                                                                                                                                                                                                                                                                |
 | Knative Secrets            | A simple app that demonstrates how to use a Kubernetes secret as a Volume in Knative.                                                                                                                                    |                                                                                                                                                                                                                                                                                    [Go](./secrets-go/README.md)                                                                                                                                                                                                                                                                                    |
 | REST API                   | A simple Restful service that exposes an endpoint defined by an environment variable described in the Knative Configuration.                                                                                             |                                                                                                                                                                                                                                                                                   [Go](./rest-api-go/README.md)                                                                                                                                                                                                                                                                                    |
 | Telemetry                  | This sample runs a simple web server that makes calls to other in-cluster services and responds to requests with "Hello World!". The purpose of this sample is to show generating metrics, logs, and distributed traces. |                                                                                                                                                                                                                                                                                   [Go](./telemetry-go/README.md)                                                                                                                                                                                                                                                                                   |
-| Thumbnailer                | An example of deploying a "dockerized" application to Knative Serving which takes video URL as an input and generates its thumbnail image.                                                                               |                                                                                                                                                                                                                                                                                  [Go](./thumbnailer-go/README.md)                                                                                                                                                                                                                                                                                  |
 | Traffic Splitting          | This samples builds off the [Creating a RESTful Service](./rest-api-go) sample to illustrate applying a revision, then using that revision for manual traffic splitting.                                                 |                                                                                                                                                                                                                                                                               [YAML](./traffic-splitting/README.md)                                                                                                                                                                                                                                                                                |