also refactor nixos modules

modules/nixos/system/networking.nix

@@ -0,0 +1,28 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib) mkDefault;
+
+  cfg = config.sneeuwvlok.system.networking;
+in {
+  options.sneeuwvlok.system.networking = {};
+
+  config = {
+    systemd.services.NetworkManager-wait-online.enable = false;
+
+    networking = {
+      enableIPv6 = true;
+      useDHCP = mkDefault true;
+
+      firewall.enable = true;
+
+      networkmanager = {
+        enable = true;
+        wifi.backend = "wpa_supplicant";
+      };
+    };
+  };
+}