Using AccessProviders other than Auth0 or Okta

@lewisl and @eidam

I’m excited to announce that Fauna’s External Authentication is no longer limited to Okta, Auth0, and OneLogin, enabling users to configure 3rd party authentication with their choice of IdP. Lifting this constraint also enables users to use branded URLs, as offered by Auth0’s Custom Domains, or Okta’s Custom URL Domains. Please contact product@fauna.com if you have any questions.