Project mirrors: Make it easier to set up URL

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I spent several minutes trying to add a push mirror in the Repository settings. Things I did wrong:

1. Left out .git in the URL. This resulted in a 301 error (https://forum.gitlab.com/t/fork-synching-by-using-mirroring-repositories-fails/32235/2).
2. Added a username and password to the URL (e.g. https://user:mypassword@gitlab.example.com), expecting the password to be extracted. Left the password out in the form. Turns out that doesn't work.
3. Not being sure about username:password syntax. It might be clearer if we add a separate Username field that also gets populated if a user enters this in the URL.

I'd suggest:

1. Warn or automatically append .git for well-known providers. Or allow redirects to .git.
2. Automatically extract the password if it's not provided in the form. This could be done on the backend and/or frontend (the latter would at least provide feedback to the user).
3. Make it possible to edit the settings with a new username/password or URL.
4. Add a username field.

Also the alignment seems off: