FlutterFlow now works with custom authentication (Xano)

FlutterFlow just rolled out a new update that makes authenticating with Xano a much better process than it has been. See the new announcement: https://community.flutterflow.io/c/whats-new-in-flutterflow/post/what-s-new-in-flutterflow-october-23th-2023-KGHbTgAHrC4pQ8P

@Michael Udinski Do you think you could update your Xano/FlutterFlow authentication tutorial with this change? I'm particularly interested in how you might handle the Refresh token.