feat: add gamemode and gamescope /w CAP_SYS_NICE

modules/nixos/gaming.nix

@@ -5,11 +5,12 @@
     zw.gaming.enable = lib.mkEnableOption "Enable Gaming";
   };
 
+  # https://wiki.nixos.org/wiki/Category:Gaming
   config = lib.mkIf config.zw.gaming.enable {
     environment.systemPackages = with pkgs; [
       mangohud
       protonup-qt
-      # lutris  # TODO: Having an issue after flake update
+      lutris  # TODO: Having an issue after flake update
       bottles
       heroic
     ];
@@ -20,5 +21,11 @@
       protontricks.enable = true;
       gamescopeSession.enable = true;
     };
+
+    programs.gamemode.enable = true;
+    programs.gamescope = {
+      enable = true;
+      capSysNice = true;
+    };
   };
 }