Add multi-host configuration

based loosely on https://github.com/tom-on-the-internet/system-configuration

hosts/elnupad/default.nix

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+{ ... }:
+
+{
+  imports = [ (import ./hardware-configuration.nix) ];
+
+  boot.loader = {
+    efi = {
+      canTouchEfiVariables = true;
+      efiSysMountPoint = "/boot";
+    };
+    grub = {
+      efiSupport = true;
+      device = "nodev";
+      # 1024x768 is the closest supported resolution to X220's native 1366x768
+      # To see a list of supported GRUB resolutions, enter GRUB,
+      # press e, F2 to enter command mode, and then type videoinfo to see list
+      gfxmodeEfi = "1024x768";
+    };
+  };
+
+  networking.hostName = "elnupad";
+
+  time.timeZone = "America/Los_Angeles";
+
+  # Use X11 caps lock to escape remap in TTY
+  console.useXkbConfig = true;
+  services.xserver.xkbOptions = "caps:escape";
+}

hosts/elnupad/hardware-configuration.nix

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+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [ ];
+
+  boot.initrd.availableKernelModules = [ "ehci_pci" "ahci" "usb_storage" "sd_mod" "sdhci_pci" ];
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+  boot.kernelModules = [ "kvm-intel" "coretemp" ];
+  boot.extraModulePackages = [ ];
+  
+  hardware.enableAllFirmware = true;
+  hardware.enableRedistributableFirmware = true;
+
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-label/nixos";
+      fsType = "ext4";
+    };
+    "/boot" = {
+      device = "/dev/disk/by-label/boot";
+      fsType = "vfat";
+    };
+  };
+
+  swapDevices = [ ];
+
+  # 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.enp0s3.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

hosts/elnupad/home.nix

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+{ pkgs, ... }: {
+
+}