Graciously borrowed from https://codeberg.org/robots.txt
I checked, and forgejo is being hit by crawlers trying dead links and whatnot.
Reviewed-on: https://git.data.coop/data.coop/ansible/pulls/233
Reviewed-by: valberg <valberg@orn.li>
Co-authored-by: Reynir Björnsson <reynir@reynir.dk>
Co-committed-by: Reynir Björnsson <reynir@reynir.dk>