Add possibility of removed content to 404 page (#6913)
Done to clarify a few edge-case situations.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6913
Reviewed-by: Beowulf <beowulf@beocode.eu>
Co-authored-by: Panagiotis "Ivory" Vasilopoulos <git@n0toose.net>
Co-committed-by: Panagiotis "Ivory" Vasilopoulos <git@n0toose.net>
authored by