Add GNOME

- Add config option to switch between window managers / desktop environments
- Remove systemPackages attribute when a service or program attribute is available
- Add GNOME to gui

system/hardware/audio.nix

@@ -1,8 +1,6 @@
 { config, lib, pkgs, ... }:
 
 {
-  environment.systemPackages = [ pkgs.pipewire ];
-  hardware.pulseaudio.enable = false;
   sound.enable = true;
   security.rtkit.enable = true;
   services.pipewire = {