ADD network config for d2nix

hosts/d2nix/nixos/network.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, ... }:
+
+{
+  networking = {
+#    useDHCP = false;
+    interfaces.enp0s31f6.useDHCP = true;
+    networkmanager.enable = true;
+    stevenblack.block = [ "fakenews" "gambling" "porn" ];
+    firewall = {
+      enable = true;
+      allowedTCPPortRanges = [ 
+        { from = 1714; to = 1764; } # KDE Connect
+      ];  
+      allowedUDPPortRanges = [ 
+        { from = 1714; to = 1764; } # KDE Connect
+      ];  
+    };
+  };
+}