moved nvidia.nix to common/optional

common/optional/nvidia.nix

@@ -0,0 +1,14 @@
+{ config, ... }:
+{
+  services.xserver.videoDrivers = [ "nvidia" ];
+  hardware = {
+    nvidia = {
+      modesetting.enable = true;
+      powerManagement.enable = true;
+      package = config.boot.kernelPackages.nvidiaPackages.beta;
+      nvidiaSettings = true;
+      open = true;
+    };
+    nvidia-container-toolkit.enable = true;
+  };
+}