Simplify system and home options

modules/system/services/server/ddclient/default.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+{
+  config = lib.mkIf config.system.server.enable {
+    services.ddclient = {
+      enable = true;
+      protocol = "cloudflare";
+      zone = "${config.domains.p2}";
+      usev6 = "";
+      username = "token";
+      passwordFile = "${pkgs.writeText "cloudflareapikey" config.secrets.flareApiKey}";
+    };
+    environment.persistence."/persist".directories = [
+      "/var/lib/private/ddclient"
+    ];
+  };
+}