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/sddm.nix

@@ -1,10 +1,10 @@
 # NOTE(starter): This is just a basic enabling of the XFCE windows manager for simplicity
 {
-services.displayManager = {
+  services.displayManager = {
     sddm.enable = true;
     sddm.wayland = {
       enable = true;
       compositor = "kwin";
     };
-};
+  };
 }