Followup to https://codeberg.org/forgejo/forgejo/pulls/4760
* some refactoring
* move rules out of repo.css to a new module
* simplify selectors by omitting .list: it is now only used to style the list itself, they're still precise enough in scope of .user-cards
* apply wrap/ellipsis to cards' content. Done via CSS to avoid spamming gt-ellipsis in the template
* prevent cards with long content from taking horizontal space from other cards
* prevent such cards from causing horizontal overflow on mobile
* prevent varying card height, it doesn't look good even with text wrapping
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6799
Reviewed-by: Otto <otto@codeberg.org>
Co-authored-by: 0ko <0ko@noreply.codeberg.org>
Co-committed-by: 0ko <0ko@noreply.codeberg.org>
