This adds argument `auth` and deprecates `login_or_token`, `password`, `jwt`, and `app_auth` arguments of `github.Github`.
This adds argument `auth` and deprecates `integration_id`, `private_key` of `github.GithubIntegration`.
This deprecates the `create_jwt` method of `github.GithubIntegration`, replaced by `github.Auth.AppAuth.create_jwt`.
Now that GitHub have moved their documentation from
developer.github.com, we should update our links. I have also tried to
update the call strings to their new format, but since it was done via
regex, some of them may not match exactly.
