more progress on custom options config

modules/features/nixos/home-manager.nix

@@ -1,4 +1,8 @@
 { inputs, self, ... }: {
+  imports = [
+    inputs.home-manager.flakeModules.home-manager
+  ];
+
   flake.nixosModules.global = { pkgs, lib, config, ... }: {
     imports = [
       inputs.home-manager.nixosModules.default
@@ -9,7 +13,8 @@
     config.home-manager = lib.mkIf (config.features.nixos.home-manager.enable) {
       useGlobalPkgs = true;
       useUserPackages = true;
-      users.grey = self.homeModules.${config.networking.hostName};
+      backupFileExtension = "bak";
+      users.grey = self.homeModules.${config.info.hostName};
     };
   };
 }