style(contactos): info and hours in two columns beside the form

Drops the duplicate «Envia-nos uma mensagem» heading (the app form has its
own) and gives the narrower form the right half.

site/assets/css/style.css

@@ -1653,9 +1653,13 @@ section[id] {
   margin-bottom: 2.5rem;
 }
 
-/* The form heading is an h3 under the section's h2 — keep the h2 look. */
-h3.contact-title {
-  font-size: 2.25rem;
+/* The FitMe app form (iframe, max 480px): centred when it stacks under the info. */
+#fitme-form-site-contacto {
+  display: block;
+  margin-inline: auto;
+}
+@media (max-width: 991px) {
+  #contact-form { margin-top: 1rem; }
 }
 
 .contact-info-warp {