Summit for Lemmy

Invalid date

Full changelog: https://lemmy.world/post/16865154
- When opening a link to a post on a different instance, added a banner to explaining the instance mismatch and also have an option to switch instances. Also added a loading spinner when switching instances in this way.
- Added a "Make available offline" button to make a feed available offline.
- Changed bookmark button to reflect the current state. Eg. if the post is already bookmarked then the bookmark icon is filled.
- More bug fixes.