Allow --repo '~emersion/hut' and --repo 'sr.ht/~emersion/hut'.
--repo '~emersion/hut'
--repo 'sr.ht/~emersion/hut'
We should also accept --repo https://git.sr.ht/~emersion/hut.
--repo https://git.sr.ht/~emersion/hut
Instance is now taken into account, owner is still a TODO.