Fix layout issue (specifically to disallow scrolling on mobile)

app/[lang]/qui-sommes-nous/page.tsx

@@ -5,8 +5,8 @@ export default function About() {
   const t = useTranslations("About");
 
   return (
-    <header className="mb-16 grid place-items-center bg-white dark:bg-gray-800">
-      <div className="h-full max-w-5xl bg-white px-4 pt-8 lg:pt-16 dark:bg-gray-800">
+    <section className="grid place-items-center bg-white dark:bg-gray-800">
+      <div className="max-w-5xl px-4 py-8 lg:py-16">
         <h2
           className="mb-8 text-center text-4xl font-extrabold tracking-tight text-gray-900 dark:text-white"
           data-test="header2"
@@ -117,6 +117,6 @@ export default function About() {
           })}
         </p>
       </div>
-    </header>
+    </section>
   );
 }