refactor(niri): rename the module to niri.nix for clarity

hosts/neon/configuration.nix

@@ -4,10 +4,10 @@
   imports = [
     ../../modules/nixos/audio.nix
     ../../modules/nixos/bootloader.nix
-    ../../modules/nixos/compositor.nix
     ../../modules/nixos/gnupg.nix
     ../../modules/nixos/locales.nix
     ../../modules/nixos/networking.nix
+    ../../modules/nixos/niri.nix
     ../../modules/nixos/noctalia.nix
     ../../modules/nixos/openssh.nix
     ../../modules/nixos/packages.nix

modules/nixos/niri.nix

@@ -0,0 +1,11 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # just enable and install niri
+  programs.niri.enable = true;
+
+  # Add compositor-related packages
+  environment.systemPackages = with pkgs; [
+    xwayland-satellite
+  ];
+}