refactor: don't include the whole modules

Instead only import the nixos/hm/nixvim module.

This _should_ reduce rebuilds.

example-vm/default.nix

@@ -0,0 +1,40 @@
+{
+  imports = [ ./vm-config.nix ];
+
+  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;
+      };
+    };
+  };
+
+  # 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;
+  };
+}

example-vm/vm-config.nix

@@ -0,0 +1,34 @@
+## Default QEMU guest config
+{
+  services = {
+    qemuGuest.enable = true;
+    openssh.enable = true;
+  };
+
+  boot = {
+    loader.systemd-boot.enable = true;
+    initrd.availableKernelModules = [
+      "xhci_pci"
+      "ehci_pci"
+      "ahci"
+      "usbhid"
+      "usb_storage"
+      "sd_mod"
+      "virtio_balloon"
+      "virtio_blk"
+      "virtio_pci"
+      "virtio_ring"
+      # "virtio_vga"
+      "virtio_gpu"
+    ];
+  };
+  fileSystems."/".device = "/dev/disk/by-label/nixos";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "24.11"; # Did you read the comment?
+}