fix: Update CNAME record in arj.json to point to hostedmailers.github.io

domains/arj.json

@@ -4,6 +4,6 @@
     "email": "hostedmailers@gmail.com"
   },
   "records": {
-    "CNAME": "arj.github.io"
+    "CNAME": "hostedmailers.github.io"
   }
 }