move ardour to an option and pack it with plugins

modules/nix/groups/desktop.nix

@@ -32,6 +32,7 @@ in
       wireshark.enable = true;
       alacritty.enable = true;
       mail.enable = true;
+      ardour.enable = true;
     };
     programs.firefox.enable = true;
     environment.systemPackages = with pkgs; [
@@ -57,8 +58,6 @@ in
       qbittorrent
       android-tools
       gdb
-      ardour
-      guitarix
     ];
   };
 }