refactor: move user configs into separate dir

hosts/hw-vm.nix

@@ -0,0 +1,26 @@
+{ config, lib, pkgs, modulesPath, ... }: {
+  imports = [
+    "${modulesPath}/profiles/qemu-guest.nix"
+  ];
+
+  boot.initrd.availableKernelModules = lib.mkDefault [ "uhci_hcd" "ehci_pci" "ahci" "virtio_pci" "virtio_scsi" "sd_mod" "sr_mod" ];
+
+  fileSystems."/" = lib.mkDefault {
+    device = "/dev/disk/by-label/nixos";
+    autoResize = true;
+    fsType = "ext4";
+  };
+  fileSystems."/boot" = lib.mkDefault {
+    device = "/dev/disk/by-label/ESP";
+    fsType = "vfat";
+  };
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp6s18.useDHCP = lib.mkDefault true;
+
+  # nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}