Establish a automated workflow from "local" commit to "universal" changelog #28

### Tasks
- [x] `commit` into *Release note (draft)*
- [x] *Release note (draft)* into *Release note (published)*
- [x] *Release note* into `CHANGELOG.md`
- [ ] `CHANGELOG.md` into *combined `CHANGELOG.md`* of [ft-platform](https://github.com/figuren-theater/ft-platform) or [ft-platform-collection](https://github.com/figuren-theater/ft-platform-collection)
- [ ] *combined `CHANGELOG.md`* into human-readable version at [websites.f.f.t/changelog](https://websites.fuer.figuren.theater/changelog/)