refactor(nixos): move networking config to its own module

modules/nixos/hardware/default.nix

@@ -10,7 +10,6 @@ in
   imports = [
     ./nvidia.nix
     ./audio.nix
-    ./networking.nix
   ];
 
   options.hardware = {

modules/nixos/hardware/networking.nix

@@ -1,27 +0,0 @@
-{ config, lib, ... }:
-let
-  inherit (lib) singleton;
-in
-{
-  config = {
-    networking = {
-      enableIPv6 = false;
-      useDHCP = lib.mkDefault true;
-      hostName = config.system.hostname;
-      networkmanager.enable = true;
-    };
-
-    services.openssh = {
-      enable = true;
-      settings = {
-        PrintMotd = true;
-      };
-    };
-
-    services.tailscale = {
-      enable = true;
-      authKeyFile = config.sops.secrets."keys/tailscale".path;
-    };
-    persistDirs = singleton "/var/lib/tailscale";
-  };
-}