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/waybar.nix

@@ -0,0 +1,23 @@
+{pkgs, ...}: {
+  # Install waybar system-wide and provide a systemd user service to start it for graphical users
+  environment.systemPackages = with pkgs; [waybar jq wl-clipboard];
+
+  systemd.user.services.waybar = {
+    description = "Waybar for Niri sessions";
+    wantedBy = ["default.target"];
+    serviceConfig = {
+      ExecStart = "${pkgs.waybar}/bin/waybar";
+      Restart = "on-failure";
+      RestartSec = 2;
+    };
+  };
+
+  # Optionally provide a default system-level config in /etc/xdg/waybar/config
+  environment.etc."xdg/waybar/config".text = ''
+    {
+      "modules-left": ["workspace"],
+      "modules-center": [],
+      "modules-right": ["clock"]
+    }
+  '';
+}