[secrets] Remove altogether

I'm standardizing on bitwarden and rbw for secrets. No need to build out
a separate secret management system. The complexity of this was just not
worth it for my effectively single-user workflows

roles/default.nix

@@ -10,7 +10,6 @@ with lib;
     ./kodi
     ./nfs-mounts
     ./printing
-    ./secrets
     ./spotifyd
     ./users
     ./virtualisation