start to remove modules in favour of options

modules/features/nixos/nh.nix

@@ -0,0 +1,19 @@
+{ inputs, self, ... }: {
+  flake.nixosModules.global = { pkgs, config, lib, ... }: {
+    options.features.nixos.nh.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+    };
+
+    config = lib.mkIf (config.features.nixos.nh.enable) {
+      environment.systemPackages = [
+        inputs.nh.packages.${pkgs.stdenv.hostPlatform.system}.default
+      ];
+
+      programs.nh = {
+        enable = true;
+        flake = "/home/grey/nixos";
+      };
+    };
+  };
+}