nix: Make nix the root

Which means now I'll have to think about real prefixes in commit names.

os/wireless.nix

@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+{
+  # wireless support via wpa_supplicant
+  # TODO This doesn't change anything, at least in the VM
+  networking.wireless = {
+    enable = true;
+    networks = builtins.fromJSON (builtins.readFile ./wireless/networks.json); # If this file doesn't exist, run ./wireless/import.py
+    extraConfig = ''
+      country=NL
+    '';
+  };
+  environment.systemPackages = with pkgs; [ wirelesstools ];
+  services.chrony.serverOption = "offline";
+}