Also use `packagesFromDirectoryRecursive` to make the NixOS module(s).

Flake lock file updates:

• Updated input 'crane':
    'github:ipetkov/crane/3cb338ce81076ce5e461cf77f7824476addb0e1c' (2024-11-19)
  → 'github:ipetkov/crane/f2b4b472983817021d9ffb60838b2b36b9376b20' (2024-11-24)
• Updated input 'fenix':
    'github:nix-community/fenix/3b89d5df39afc6ef3a8575fa92d8fa10ec68c95f' (2024-11-22)
  → 'github:nix-community/fenix/39603febfbb0b494a368905a5c5c1b13bd6e1e53' (2024-11-24)

And a bunch of deletions.