Tutorial on incremental microservices capabilities

[niallthomson]

So far the ability to use anything from just the UI component all the way through to a fully distributed architecture with as many component as are necessary is largely undocumented. This feature makes the application useful for situations where simpler architecture are necessary and the full architecture may be over-complicated.

Create a tutorial that walks the user through:

1. Deploying just the UI component
2. Add the separate carts service (in-memory storage)
3. Add the catalog service with database

This should be done in Docker Compose to make it accessible to the most people.