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/common/optional/niri/swayidle.nix

@@ -0,0 +1,13 @@
+{pkgs, ...}: {
+  # Install swayidle and configure a systemd user service for idle locking
+  environment.systemPackages = with pkgs; [swayidle swaylock inotify-tools];
+
+  systemd.user.services.swayidle = {
+    description = "swayidle for Niri sessions";
+    wantedBy = ["default.target"];
+    serviceConfig = {
+      ExecStart = "${pkgs.swayidle}/bin/swayidle -w 'timeout 300 ${pkgs.swaylock}/bin/swaylock -f' resume 'swaymsg resume'";
+      Restart = "on-failure";
+    };
+  };
+}