started modifing configuration structure

system/network/default.nix

@@ -0,0 +1,9 @@
+{ systemSettings, ... }:
+{
+  networking = {
+    hostName = systemSettings.hostname;
+    networkmanager.enable = true;
+    firewall.enable = true;
+  };
+  systemd.network.wait-online.enable = false;
+}