graphical: move nvidia to toplevel, remove

graphical/games/default.nix

@@ -1,31 +0,0 @@
-{
-  lib,
-  config,
-  ...
-}:
-
-let
-  name = "games";
-  cfg = config.nixowos.graphical.${name};
-in
-{
-  imports = [
-    ./mangohud.nix
-    ./steam.nix
-  ];
-
-  options.nixowos.graphical.${name} = {
-    enable = lib.mkEnableOption name;
-  };
-
-  config = lib.mkIf cfg.enable {
-    nixowos.graphical.${name} = lib.mkDefault {
-      mangohud.enable = true;
-      steam.enable = true;
-    };
-
-    # load ntsync, which can improve performance
-    # for games running through wine/proton using it
-    boot.kernelModules = [ "ntsync" ];
-  };
-}