This commit introduces comprehensive support for post groups across different domains:
- Created PostGroupsController to handle viewing post groups
- Added new views for displaying post groups and their associated posts
- Implemented policies for post groups
- Enhanced models to support post group functionality
- Updated routes to support post group navigation
- Added helper methods for post group interactions
- Improved GoodJob argument rendering for post groups
The changes provide a unified way to view and interact with post collections across different domains like Inkbunny and E621.