publish _redirect txt's for reserved domains

dnsconfig.js

@@ -149,6 +149,7 @@ for (var i = 0; i < reserved.length; i++) {
         subdomainName !== "ns4"
     ) {
         records.push(A(subdomainName, IP("192.0.2.1"), CF_PROXY_ON));
+        records.push(TXT("_redirect." + subdomainName, "\"https://is-a.dev/reserved\""));
     }
 }