Add top-level comment navigation #212
Description
Describe the feature
Add buttons in thread view that allow the user to jump between top-level comments.
Additionally, a toggle in settings to allow the user to jump between comments with the volume buttons would also be really nice.
Additional context
See the following for more details:
- Thunder for Lemmy (https://github.com/thunder-app/thunder/blob/develop/lib/shared/comment_navigator_fab.dart)
- Summit for Lemmy (https://github.com/idunnololz/summit)
- Boost for Lemmy/Reddit (https://play.google.com/store/apps/details?id=com.rubenmayayo.lemmy&hl=en-US)