Release v12.0.0

This is the first release of this new fork.
Main thing changed is the rollout and config management:
You can now just serve the attached build, and modify your dynamically loaded config.json (from config.json.example) and there you go.
This should make things much easier with configuration management etc. - drawback is the non-personalized loading screen etc. - if you need personalized meta-tags etc., please open an issue.