Add Niri desktop configuration with integrated utilities

- Introduced a new power menu script using fuzzel for session management.
- Updated Bellerophon configuration to include Niri desktop and its components.
- Removed obsolete README for Niri and consolidated its configuration files.
- Added swayidle and swaylock integration for idle management and screen locking.
- Implemented waybar for status bar functionality with basic configuration.
- Created fuzzel integration for application launching and menu access.
- Added zenbook debugging scripts for display and keyboard diagnostics.
- Migrated keyring and other configurations to streamline Niri setup.
- Enhanced display management with systemd services for better integration.

hosts/nixos/Bellerophon/default.nix

@@ -74,7 +74,7 @@
       "hosts/common/optional/services/ollama.nix"
       "hosts/common/optional/services/docker.nix"
       "hosts/common/optional/audio.nix" # pipewire and cli controls
-      "hosts/common/optional/gnome.nix"
+      "hosts/common/optional/niri.nix"
       "hosts/common/optional/gdm.nix"
       "hosts/common/optional/flatpak.nix"
       "hosts/common/optional/thermal-management.nix"