[nix] moves gaming stuff to it's own file.

home-manager/features/gaming.nix

@@ -0,0 +1,16 @@
+{ pkgs, ... }:
+{
+  home.packages = with pkgs; [
+    # Gaming
+    mangohud
+    (lutris.override {
+      extraPkgs = pkgs: [
+        winetricks # Needed for bnet setup.
+        vulkan-tools # Needed for bnet setup
+      ];
+    })
+    protonup-ng
+    vulkan-tools # useful for debugging Vulkan issues
+    wowup-cf
+  ];
+}