Toggle keyboard with both control keys

systems/catullus/hardware-configuration.nix

@@ -0,0 +1,20 @@
+{ config, lib, pkgs, ... }:
+{
+  imports = [ ./config.nix ];
+
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+  boot.kernelParams = [ "cma=32M" ];
+
+  fileSystems = {
+    "/boot" = {
+       device = "/dev/disk/by-label/NIXOS_BOOT";
+       fsType = "vfat";
+    };
+    "/" = {
+      device = "/dev/disk/by-label/NIXOS_SD";
+      fsType = "ext4";
+    };
+  };
+
+  swapDevices = [ { device = "/swapfile"; size = 1024; } ];
+}