Support github enterprise authentication

[amazingguni]

Our company uses GitHub Enterprise.
But i found there is no support for GitHub Enterprise, only public github.
So i'd like to expand outline github feature to use GitHub Enterprise for authentication.

• outline/plugins/github/server/github.ts

  Line 83 in d8fbe35

  export class GitHub {

I’ll work it and create a pull request. so I’d appreciate your feedback. 😄

[tommoor]

Ah yes, we only support GitHub cloud right now. Supporting enterprise is interesting (although more complex), but I think we'd want to restrict that to Outline's licensed edition – if you're paying for GitHub Enterprise that's a company that should be paying for Outline as well.

[amazingguni]

i see. thanks for answer

[djhons]

I created a free GitHub organization. How should I configure it to allow users in this organization to log in to Outline? I have enabled OAuth, and I need to make my email public to log in properly, but other users who have made their email public are unable to log in.