Remove SSR code

[lydiapuric]

The Starter Kit should not have any reference to the SSR implementation in the code, poms, readme, ...

[norbiorb]

Angular-app: Removed:

• server.ts
• src/app/app.server.module.ts
• src/main.server.ts
• src/tsconfig.server.json
• webpack.server.config.js

Adapted:

• angular.json
• package.json
• DEVELOPMENT.md

React-app Removed: src/server folder Moved up src/server/CustomModelClient.js to react-app folder

Adapted: DEVELOPMENT.md

Same for the test files