feat(gaming): add enable option

modules/gaming/default.nix

@@ -1,11 +1,17 @@
 {
-  config,
   lib,
+  config,
   pkgs,
   ...
 }:
 
+let
+  cfg = config.gaming;
+in
 {
+  options.gaming.enable = lib.mkEnableOption "gaming";
+
+  config = lib.mkIf cfg.enable {
     nixpkgs.allowedUnfree = [
       "steam"
       "steam-unwrapped"
@@ -29,7 +35,6 @@
     programs.gamemode.enable = true;
 
     environment.systemPackages = with pkgs; [
-    # lutris
       mangohud
     ];
 
@@ -47,4 +52,5 @@
         value = "524288";
       }
     ];
+  };
 }