- improve issue page icons and icon states
- make issue comments more like pull comments
- padding and spacing consistency across the board

- improve issue page icons and icon states
- make issue comments more like pull comments
- padding and spacing consistency across the board

drive-by fix: style the separator between pull submissions

path.Match does not work as expected; but our ACLs currently do not make
use of these anyway. glob/wildcard matching can be implemented in the
future.

Also make the repo action button font size text-sm.

drive-by fixes:
- make the edit icon for repo-descriptions more compact
- do not double-pad rendered blob contents