Django-cast

Splitting up post in episodes and posts is the big new feature in this release.

Features
- More information about the release process, so I don't have to guess every time I publish a new release
- Split up post page model in episodes and posts
- Renamed test files to make the names easier searchable
- Use a JSONField for the audio model to cache file sizes
- Added twitter player card metadata to episode detail page + single button player view

Fixes
- Fixed [codecov](https://codecov.io) badge
- Added mypy to pre-commit hooks and fixed some issues
- Fixed Post form in django admin (don't try to save body stream field)
- Fixed a little issue raising an exception when an unknown language is set for a code block
- Removed to warnings showing up running migrations

Podlove Player share sheet and code blocks for Wagtail.

Features
- Added code blocks for Wagtail adding [Pygments](https://pygments.org/docs/) as a dependency

Fixes
- Fixed share sheet of Podlove Player

Refactoring
- Removed some of the pytest.mark.django_db decorators
- Removed all the request analytics stuff (switched using plausible...)
- Removed django-watson dependency since it is not used anymore

Fixed a bad spam filter bug leading to comments being classified as ham which have lots of unknown words.

Features
- improved spam filter

Fixes
- comment posting (min instead of slim jquery dependency)
- api overview is working again

This release took a long time. I can't even remember when exactly I started working on this. Some years ago I guess 😁.

Features
- CMS based on wagtail instead of custom template tags
- Using flit instead of poetry
- Updates of bootstrap / jquery etc
- Docs based on furo theme