refactor: switch from modules to import arrays

modules/nixos/features/gaming.nix

@@ -1,44 +1,35 @@
 {
-  config,
-  lib,
   pkgs,
   ...
 }:
-let
-  feature = "gaming";
-in
 {
-  config = lib.mkIf config.${feature}.enable {
-    environment.systemPackages = with pkgs; [
-      # keep-sorted start
-      heroic
-      lutris
-      mangohud
-      nexusmods-app
-      prismlauncher
-      protonup-qt
-      wine
-      wine64
-      winetricks
-      # keep-sorted end
-    ];
+  environment.systemPackages = with pkgs; [
+    # keep-sorted start
+    heroic
+    lutris
+    mangohud
+    nexusmods-app
+    prismlauncher
+    protonup-qt
+    wine
+    wine64
+    winetricks
+    # keep-sorted end
+  ];
 
-    programs = {
-      gamemode.enable = true;
-      steam = {
-        enable = true;
-        gamescopeSession.enable = true;
-      };
-    };
-
-    services.lact = {
+  programs = {
+    gamemode.enable = true;
+    steam = {
       enable = true;
-      settings = { };
+      gamescopeSession.enable = true;
     };
-
-    # latest kernel
-    boot.kernelPackages = pkgs.linuxPackages_latest;
   };
 
-  options.${feature}.enable = lib.mkEnableOption "enables ${feature}";
+  services.lact = {
+    enable = true;
+    settings = { };
+  };
+
+  # latest kernel
+  boot.kernelPackages = pkgs.linuxPackages_latest;
 }