community/gogs: remove

Upstream does not respond to security vulnerabilties for over a year.

Users should migrate to alternatives like forgejo or gitea.

Ref: https://github.com/gogs/gogs/issues/7777 Ref: https://forgejo.org/2023-11-release-v1-20-5-1/#responsible-disclosure-to-gogs

Closes #16616 (closed)