That honestly reads exactly like an engineer wrote it. Simple, informative*, usable. Error clearly visible with a hint of humor.

* given that you are a programmer/IT and are using Codeberg Pages. TIL they even had a service like that.

Probably someone was using Codeberg to host their website, configured the domain to point to Codeberg, forgot about it, and broke/moved/deleted the repo. If you have a means of reaching out to the site owner, maybe best to let them know so they can look into it or open a support ticket with Codeberg.