feat: transition from Hyprland to GNOME desktop environment

- Updated Bellerophon configuration to include GNOME desktop settings and packages.
- Added GNOME-specific packages and extensions for enhanced user experience.
- Introduced scripts for display management tailored for ZenBook Duo under GNOME.
- Implemented systemd services for automatic display management and backlight control.
- Integrated UWSM for improved session management in Hyprland.
- Enhanced lid monitoring and USB display management scripts for ZenBook Duo.
- Configured keyring support for GNOME and integrated it with PAM.
- Updated display manager settings to enable GDM for GNOME sessions.

hosts/common/optional/gnome.nix

@@ -23,7 +23,6 @@
   ];
 
   environment.systemPackages = with pkgs; [
-    gnomeExtensions.appindicator
     gsettings-desktop-schemas
   ];
 }