feat: Rename device.nix to default.nix for nixos and darwin

linux/default.nix

@@ -24,17 +24,4 @@
     enable = device.hasGui;
     startInBackground = true;
   };
-  # systemd.user.services.spotify-player = {
-  #   Install = {WantedBy = ["graphical-session.target"];};
-  #   Unit = {
-  #     Description = "Spotify Player Daemon";
-  #     After = ["graphical-session.target"];
-  #   };
-  #   Service = {
-  #     ExecStart = "${pkgs.spotify-player}/bin/spotify_player -d";
-  #     Restart = "on-failure";
-  #     RestartSec = "5";
-  #     User = "${device.user}";
-  #   };
-  # };
 }