* fix: assign new oauth users to default org
This is not a final solution, as we eventually want to be able
to map to different orgs. This makes it so multi-org does not break oauth/oidc.
* feat: Allow changing the 'group' oidc claim field
* Enable empty groups support
* fix: Delete was wiping all groups, not just the single user's groups
* Update docs
* fix: Dbfake delete group member fixed
