User data mirroring from auth to profile table could use more detailed examples in the docs

[fnimick]

An example of a system I have put together: https://gist.github.com/fnimick/37269e61f4e2374290b76554d8f994ab

This mirrors selected information from raw_user_meta_data to a public.profile table, and vice versa.

This is a fairly common use case and a explicitly endorsed pattern for doing this bidirectional syncing would be very helpful. There have been multiple questions in the discord in recent days from people having problems with this sort of setup.