Django-cast

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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

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Bugfixes:

- 122 Sometimes galleries had no id -> re-publishing posts with those galleries fixed this
- 124 Implicit feed caching caused delivering sometimes the wrong feed
- 125 Use absolute link in feed when linking to a post (podcast clients break on relative links)

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Feed performance improvements.

- 118 Fix performance for feeds with many items / images
- 121 Add support for [Wagtail 6](https://docs.wagtail.org/en/latest/releases/6.0.html).
- dropped support for Wagtail 4 and Django < 4.2
- some pre-commit and javascript updates

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Bugfix release. Multiple galleries per post were not working when using the
default gallery layout.

- 117 Fix multiple galleries per post

Use a web component for the image gallery. Have a proper build pipeline
for the web components Javascript and some tests. Have a working htmx layout
for the gallery. It's still a bit slower compared to the web component, but
it's a start.

- 114 Use web component for image gallery
- Some cleanup regarding javascript paths etc. - using a global cast prefix for example
- 116 Gallery layout using htmx for bootstrap4 and 5 themes