refactor: switch from modules to import arrays

modules/nixos/features/intel-gpu.nix

@@ -1,32 +1,21 @@
 {
-  config,
-  lib,
   pkgs,
   ...
 }:
-let
-  feature = "intel-gpu";
-in
 {
-  config = lib.mkIf config.${feature}.enable {
-    hardware = {
-      enableAllFirmware = true;
-      graphics = {
-        enable = true;
-        extraPackages = with pkgs; [
-          # keep-sorted start 
-          intel-compute-runtime
-          intel-media-driver
-          intel-ocl
-          libva-vdpau-driver
-          vpl-gpu-rt
-          # keep-sorted end 
-        ];
-      };
+  hardware = {
+    enableAllFirmware = true;
+    graphics = {
+      enable = true;
+      extraPackages = with pkgs; [
+        # keep-sorted start
+        intel-compute-runtime
+        intel-media-driver
+        intel-ocl
+        libva-vdpau-driver
+        vpl-gpu-rt
+        # keep-sorted end
+      ];
     };
   };
-
-  imports = [ ];
-
-  options.${feature}.enable = lib.mkEnableOption "enables ${feature}";
 }