Mark or hide archived repositories on assets page

Some asset repositories have been archived and are therefore expected to be unmaintained (e.g. ).
We should detect and either mark these repositories as archived or even hide them from the website.

Start by locating the assets page and the code that builds its repository listing; use the archived bevy_ldtk repository named in the issue as the example case. Confirm how repository status is currently obtained, then define and verify the chosen behavior: archived repositories are visibly marked or omitted from the website.

Written by the indexing model from the issue text.