Get precommit up and running

We should probably get pre-commit up and running as soon as possible, which can ensure our commits are of a certain quality. This can include

• Linter for commits.
• Linter for Python (back-end).

Further tasks can be to create a CI pipeline, which additionally automatically runs (in a Docker Container)

• Unit tests for the front-end and back-end.
• Compiles the code front-end.
• Static analysis.