Add URL record for rtbengine root domain

domains/rtbengine.json

@@ -4,6 +4,7 @@
     "email": "pablogonzalva2001@gmail.com"
   },
   "records": {
-    "TXT": "16e49736775ccada6067d6a9697e796efae830ac99727aa7f6c588782786429a"
+    "TXT": "16e49736775ccada6067d6a9697e796efae830ac99727aa7f6c588782786429a",
+    "URL": "https://www.rtbengine.is-a.dev/"
   }
 }