Followup to https://codeberg.org/forgejo/forgejo/pulls/6053
Adds the repository description to the "alt" tag of the OpenGraph summary card, improving accessibility when these images are displayed. Fixes#8192.
Other summary cards, for issues and releases, are not modified as they already contain the issue title or release title, which seems reasonable.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8325
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>
b6c6981c30