Conflicts:
- `app/models/account.rb`:
Not a real conflict, just upstream getting rid of unused constants too close
to glitch-soc-specific contents.
Removed unused constants like upstream did.
- `app/models/trends.rb`:
Conflict because glitch-soc disabled email notifications for trending links.
Upstream has refactored this quite a bit and added trending posts.
Took upstream code, but disabling the extra trending stuff will come in
another commit.
- `app/views/admin/trends/links/index.html.haml`:
Conflict due to glitch-soc's theming system.
Ported upstream changes accordingly.
