It seems like the repo at dev.funkwhale.audio can't be accessed. Going to that URL shows a sign in screen, but there is no sign up link. I can't see where to register for an account. I'm pretty sure that you could previously sign in with GitHub, but that isn't an option now.
I also get an error when trying to clone from the git URL on this documentation page, git@dev.funkwhale.audio/funkwhale/funkwhale.git.