[skip ci] modernize the README

Author: FakeShell

README.md

@@ -1,11 +1,11 @@
-Docker images for hybris-mobian [![Build Status](https://travis-ci.com/hybris-mobian-releng/docker-images.svg?branch=master)](https://travis-ci.com/hybris-mobian-releng/docker-images)
-==================================
+Docker images for droidian
+==========================
 
 This repository contains the required source files to build Docker images
 for various release engineering tasks (package building, hardware adaptation building, rootfs building, etc...).
 
-These are built in Travis CI and, for the 'master' branch, the build artifacts are pushed automatically
-into Docker Hub, at the [hybrismobian organization](https://hub.docker.com/orgs/hybrismobian/repositories).
+These are built in Circle CI and, for the 'master' branch, the build artifacts are pushed automatically
+into quay, at the [droidian organization](https://quay.io/repository/droidian/build-essential).
 
 Currently built images
 ----------------------
@@ -20,35 +20,10 @@ where `@template@` is the template name.
 
 The following strings are replaced:
 
-| String            | Description                            | Example (for `arm64/hybrismobian/build-essential:bullseye`) |
+| String            | Description                            | Example (for `arm64/droidian/build-essential:trixie`) |
 |-------------------|----------------------------------------|-------------------------------------------------------------|
-| `%(target_name)s` | Sanitized slug of the full target name | `arm64_hybrismobian_build_essential_bullseye`               |
+| `%(target_name)s` | Sanitized slug of the full target name | `arm64_droidian_build_essential_trixie`                     |
 | `%(arch)s`        | Architecture                           | `arm64`                                                     |
-| `%(namespace)s`   | Docker namespace                       | `hybrismobian`                                              |
+| `%(namespace)s`   | Docker namespace                       | `droidian`                                                  |
 | `%(template)s`    | Template name                          | `build-essential`                                           |
-| `%(tag)s`         | Image tag                              | `bullseye`                                                  |
-
-Once a template has been made, you must add the desired docker images ("full target name") to the build matrix into the
-`.travis.yml` file:
-
-	  # AMD64 (x86_64) image containing toolchains and essential build
-	  # tools
-	  - name: amd64/hybrismobian/build-essential:bullseye
-	    arch: amd64
-	    <<: *docker_build_template
-	  # ARM64 (AArch64) image containing toolchains and essential build
-	  # tools
-	  - name: arm64/hybrismobian/build-essential:bullseye
-	    arch: arm64-graviton2
-	    virt: vm # required to route the job to arm64-graviton2 
-	    group: edge # required to route the job to arm64-graviton2
-	    <<: *docker_build_template
-
-In this example, the same template (`build-essential`) has now specified for both amd64 and arm64 builds.  
-**Be extra sure to include the `<<: *docker_build_template` part!**
-
-Once the build matrix has been updated, build the target Dockerfiles with
-
-	make refresh-images
-
-(a recent-ish python interpreter and `pyyaml` are required).
+| `%(tag)s`         | Image tag                              | `trixie`                                                    |