fix: correct app.use()

src/scripts/contact-form.js

@@ -131,7 +131,7 @@ form.addEventListener("submit", function(event) {
         };
 
         // Send the data to the backend using fetch()
-        fetch('api/submit-form', {
+        fetch('/api/submit-form', {
             method: 'POST',
             headers: {
                 'Content-Type': 'application/json',