Django-cast

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A lot of small improvements and bugfixes in this release.

- Add defer to loading the javascript for the podlove web player
- 56 removed old documentation
- 136 Only use blog cover image as a fallback for episode cover images, not the iTunes artwork
- 140 Workaround for the page_ptr ValueError in preview serving (ignore it)
- 150 Make cover image alt text work by passing it through repositories
- 152 Add a canonical link to the blog / podcast index page
- 153 JavaScript dependency updates and new bundle
- 154 Output all relative file paths + file contents to be able to pass it to the llm command
- 155 Update theme endpoint breaks on integer json payloads
- 156 Image IDs for galleries have to be integer
- 157 Fix some chooser blocks breaking on integer values for get_prep_value

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Cover image for Blogs do also make sense. Removed the
pin to `Wagtail 6.1` since the audio and video choosers
are working again.

- 136 Added cover image for Blog, too
- 145 Surprisingly simple fix for the audio and video choosers in Wagtail 6.1
- 147 Fixed podlovePlayer not working after htmx pagination
- 148 Fixed remove null bytes in api request query parameters
- 149 Removed some unused dependencies

Some fixes.

- 141 Fixed rendering the API version of an episode
- 142 Fixed internal server error on post to facet counts list endpoint
- 143 Fixed serving posts from blog A in feed of blog B
- 144 Updated htmx to 2.0.0 beta 4
- 145 Pin wagtail to < 6.1 because of broken audio and video choosers
- 146 Fixed missing get_cover_image method on Post model -> audio player now works again for non-Episodes

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Added an optional cover image to post. For podcasts the iTunes artwork will be used
as a fallback.

- 56 Added some documentation for post and related models
- 136 Added cover image to post
- 139 Fixed codecov upload

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Podlove web player 5 is now used by default. Version 4 will still continue
to work, but it'is not officially supported anymore. This is important because adding a
transcript feature depends on this player version. It is now also possible to
overwrite the template that is used for an audio block in a theme. This is useful
if you want to heavily customize the appearance of the player.

- 65 Use podlove web player 5
- 132 Create the feed repository from cachable data, too
- 133 Test for each post whether it is a podcast episode
- 135 Support for wagtail 6.1
- 137 Make `audio.html` template themeable via `template_base_dir`
- 138 Small mypy fix

Render feed, blog index and post detail without hitting the database
using only data from the respective repositories is now working. The
repository is passed from the feed / blog / post models to the blocks
just using the template context. And there's no need for monkeypatching
the page link handler anymore, since a new page link handler is now
set via the `register_rich_text_features` wagtail hook.

- 123 Fixed an audio key error when a preview page is saved
- 125 Add a hint (click to comment ) to feed descriptions of posts where comments are enabled
- 128 Update vite + jsdom + new javascript build
- 126 Render feed / blog index / post detail using only data from repository, not database