Read settings from config file

[casonadams]

To carry on from a conversation in an MR 503.

It would be nice to be able to keep a config file of passff settings under source control.

My first thoughts would be to store a file in $XDG_HOME_CONFIG/passff/config.yml but I don't have much context on how this might work with passff.

Another option would be to create a special password entry in the pasword-store that passff can lookup and use the settings from it. This might be a more simple solution because passff already reads from the password-store.

I wouldn't might trying to take this one on after some conversation around the matter happens. And a little direction too please.