Setup instructions for credentials in DB

[pacoccino]

I propose this changes for another way of configuring local/hosted database, without modifying migration files (which induces a difference in code tree)

The idea is just to change the credentials directly within the function in the supabase studio after initial migration

[mckaywrigley]

Looks promising. Will investigate.

[fkesheh]

I recommend merging this. It's a cleaner approach and less risky.