- Replace hardcoded /var/lib/<app> paths with shb.arr.<app>.dataDir in arr.nix
- Fix bazarr config path in test to use cfg.dataDir
- Correct shb.sops.secrets → shb.sops.secret in documentation files
This makes the secret contract better (IMNSHO):
- Improves documentation, explains better the reasoning behind the
contract.
- Makes it easier to create an option implementing the secret contract.