Fly.io secrets vs fly.toml

[psonnera]

@ninelore @Jackenmen let's continue here the discussion about secrets and variables.
From the web terminal my understanding is that you need to fork the repo and update your fly.toml every time you want to modify a variable. This is not convenient for non tech people.
On the other hand you just need to set secrets by hand in the terminal mentioning your app and it will redeploy by itself without requiring the repo to be cloned.
I discussed that with @TerrysNightscout and he also believed risking that people forgot their secrets was better than having a complex method (choosing the least worse solution).

[psonnera]

#147 (comment) thanks @ninelore docs amended 7a3f91d