Integrate readme update and github release creation into release action

[Riduidel]

We previously had a set of actions, which should be combined through the grace of github scheduling.
But let's be honest, it never worked correctly. So reintegrate all that stuff into the release action.
This way, only one action will be triggered, and all changes will happen in one run.

[Riduidel]

Readme update should be done by the maven profile update_version_in_files, which should be triggered by release.
The Github release generation should be done in the GitHub action (I've yet to find back the good action)