Twitter and Facebook auth providers

[bcomnes]

Support Twitter and Facebook as auth providers - Facebook is already implemented and Twitter should be trivial, but we need to put them both in production and test that they work. They should also be added to the checkbox selection in Netlify’s UI.

[bcomnes]

We should also consider #122

[bcomnes]

Facebook is already done, but not deployed. Twitter relies on an oAuth1 authentication flow, which is a nontrivial departure from our current provider interface.

[bcomnes]

When twitter supports user authentication with oAuth2, we can revisit adding twitter as a login provider.

[triyuga]

Any update on Facebook login becoming in Netlify?

[anuaimi]

I'd also like to see the facebook support released.

[swyxio]

a fork of gotrue with twitter support is here: https://supabase.io/docs/guides/auth i dont believe its public yet but its here in case anyone cares (lol)