refactor: don't include the whole modules

Instead only import the nixos/hm/nixvim module.

This _should_ reduce rebuilds.

flake-modules/example-vm.nix

@@ -8,47 +8,11 @@ in
 {
   # Example vm configuration
   flake.nixosConfigurations.vm = lib.nixosSystem {
-    inherit system pkgs;
+    inherit pkgs;
     modules = [
-      inputs.self.nixosModules.vm # import vm module
-      {
-        time.timeZone = "Europe/Berlin";
-        i18n.defaultLocale = "en_US.UTF-8";
-        users.users.jdoe = {
-          password = "example";
-          isNormalUser = true;
-          extraGroups = [
-            "wheel"
-            "video"
-            "networkmanager"
-          ];
-        };
-        home-manager.users.jdoe = {
-          home = {
-            username = "jdoe";
-            homeDirectory = "/home/jdoe";
-          };
-          jhome = {
-            enable = true;
-            gui.enable = true;
-            dev = {
-              enable = true;
-              rust.enable = true;
-            };
-          };
-        };
-        nix.registry.nixpkgs.flake = inputs.nixpkgs;
-        # password is 'test' see module documentation for more options
-        services.jupyter.password = "'sha1:1b961dc713fb:88483270a63e57d18d43cf337e629539de1436ba'";
-        jconfig = {
-          enable = true;
-          dev = {
-            enable = true;
-            jupyter.enable = true;
-          };
-          gui.enable = true;
-        };
-      }
+      inputs.self.nixosModules.default
+      ../example-vm # import vm configuration
+      { nix.registry.nixpkgs.flake = inputs.nixpkgs; }
     ];
   };