This commit adds support to add Lemmy RSS feeds to FeedDeck. A user can
provide the url of an Lemmy instance, the url of a community or of an
user.
The special thing of the Lemmy source in opposite to the normal RSS
source is, that we parse the provided link form a feed item, to check if
it contains a image, video or YouTube url, to apply some special
formatting.
This commit adds a new source type "pinterest", which can be used to
follow the post of an user or a board on Pinterest. To use the new
source type a user can select the "Pinterest" item in the add source
modal. In the form a user can provide the username or board he wants to
follow via FeedDeck.
In the corresponding Supabase function we then convert the input
provided by the user to an valid RSS feed url for Pinterest. This means
that we have to add `/feed.rss` for users and `.rss` for boards to the
Pinterest url.
Then we generate the source and items as for the other sources and reuse
the existing components to render the preview and details item. We had
to adjust the rendering logic for these items, to ignore empty values,
from which also other sources will benefit.
- Adjust "Release" section in contributing guide.
- Disable "X" datasource, since it is not working after the latest API
adjustments.
- Update "version" key and "msix_config.msix_version" key in
"pubspec.yaml" file.
- Change user in "AddSourceReddit" widget help text.
- Enable macOS App Sandbox.
- Adjust logo for Windows version.
