switch to xonsh and add virtual machine configurations

hosts/virtual-machines/gnome/default.nix

@@ -0,0 +1,23 @@
+{ pkgs, lib, ... }:
+let
+  gnomeExtensions = with pkgs.gnomeExtensions; [ totp ];
+  packages = with pkgs; [ fastfetch ];
+in {
+  imports = [
+    ../template.nix
+    #../../../nixos/shell.nix
+  ];
+
+  services.xserver = {
+    enable = true;
+    displayManager.gdm.enable = true;
+    desktopManager.gnome.enable = true;
+  };
+
+  virtualisation.vmVariant.virtualisation = {
+    memorySize = 8192;
+    cores = 6;
+  };
+
+  environment.systemPackages = lib.lists.unique (packages ++ gnomeExtensions);
+}

hosts/virtual-machines/nixpkgs/default.nix

@@ -0,0 +1,7 @@
+{ pkgs, ... }: {
+  imports = [
+    ../template.nix
+    ../../../nixos/shell.nix
+  ];
+  environment.systemPackages = with pkgs; [ fastfetch ];
+}

hosts/virtual-machines/template.nix

@@ -0,0 +1,25 @@
+# Edit this configuration file to define what should be installed on
+# your system. Help is available in the configuration.nix(5) man page, on
+# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).
+
+{
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.hostName = "nixos";
+  networking.networkmanager.enable = true;
+
+  time.timeZone = "America/New_York";
+
+  users.users.cswimr = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+    group = "cswimr";
+    initialPassword = "cswimr";
+  };
+  users.groups.cswimr = { };
+
+  services.qemuGuest.enable = true;
+
+  system.stateVersion = "24.11";
+}