Remove 'com.eclipsesource.modelserver.coffee.model' from repository

[martin-fleck-at]

The example project is only used in test cases and the example and should be removed from the overall repository in the long term. If the project is removed at least the following changes need to be made:

• Remove dependencies from other projects, especially the test projects and the example project
• Remove CoffeePackageConfiguration and example resources from example project and add other resources so that we have at least one more model in the repository when starting the example.
• Update README to reflect the removal of the SuperBrewer3000.json file.