Repositories with incorrect URLs stop working with 1.15

The upcoming 1.15 release is less tolerant to wrong repo URLs than older versions.

Working in old versions: https://rfc2822.gitlab.io/fdroid-firefox/fdroid

Required correction for 1.15: https://rfc2822.gitlab.io/fdroid-firefox/fdroid/repo

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information