Update signup.html

signup.html

@@ -40,7 +40,7 @@
   </div>
 
   <script>
-    const BACKEND_URL = "https://gopalkrushnamahapatra-truewrite-scan.hf.space";
+    const BACKEND_URL = "https://gopalkrushnamahapatra-truewrite-scan-backend.hf.space";
 
     const form = document.getElementById("signupForm");
     const err = document.getElementById("signupError");