- Use `nickname` claim as an example, which means we only need the `openid` scope.
This is also more stable since emails can change over time.
- Put the OIDCIdentityProvider and Secret into one YAML blob, since they will likely be copy-pasted together anyway.
- Add a separate section for using alternate claims.
- Add a separate section for using a private GitLab instance.
Signed-off-by: Matt Moyer <moyerm@vmware.com>