Can't save profile page because of email

[strugee]

Please get rid of the email field in the profile page. There are a couple reasons why:

1. The most important reason by far is the fact that you can't save the page with it present. I think the @localhost component breaks Gogs' validation logic, even though it really is valid.
2. It's a long, unintelligible UUID(?) followed by a @localhost part. I'm guessing this is some internal Sandstorm thing that shouldn't be exposed to the user
3. Since it's presumably internal, the user really shouldn't be allowed to change it.