Fixes #3048 
Fixes #4029

- [x] Introduce machine generated avatars based on the user's name
(in-future allow for gravatar or similar service)
- [x] Color Code the user avatar based on their roles  
- [x] Render the staff roles as label (#3916)
- [x] Reduce the size of the rendered comment box.
- [x]  Merge activities with communication in a single timeline.  
- [x] Use htmx for comment edit function, the js version seems to break
some functionality.
- [x] Use different icons for different activities where possible. 
- [x] Render paginated comment and activities  
- [x] Cleanup/remove JSON APIs related to comments
- [x] Use the same logic for rendering of comments on the projects
module
- [x] ~Async comment add (won't be done in this PR)~
- [x] Deep-link for individual comments
- [x] fix testcases