treewide: cleanup config with enable options

user/gaming.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.my.gaming;
+in
+{
+  options.my.gaming.enable = lib.mkEnableOption { };
+  config = lib.mkIf cfg.enable {
+    my.mangohud.enable = true;
+
+    home.packages = with pkgs; [
+      # lutris-unwrapped
+      # steam # It's enabled in the system config
+      tlauncher
+      gamescope
+      glxinfo
+      vulkan-tools
+    ];
+  };
+}