build: Unify compose file for services

[StefanNemeth]

Motivation

It was rather cumbersome to set up the whole project, requiring the developer to go into different folders with seperate compose files.

Description

Unify the compose setup into one file and document it in the respective directories.

Checklist

General

• PR description explains the purpose and changes. (f.e. following the 'Conventional Commits')
• Changes have been tested locally.
• Screenshots have been attached.

Server

• Code is performant and follows best practices
• I documented the Java code using JavaDoc style.

Client

• I documented the TypeScript code using JSDoc style.
• I added multiple screenshots/screencasts of my UI changes.
• I translated all newly inserted strings into English and German.

[egekocabas]

LGTM