Update index.mdx

Author: mintlify-development[bot]

index.mdx

@@ -41,6 +41,10 @@ export const HeroCard = ({ filename, title, description, href }) => {
       Documentation
     </h1>
 
+    <div className="max-w-xl mx-auto px-4 mt-2 text-2xl text-center text-gray-700 dark:text-zinc-300 font-semibold">
+      Hello world
+    </div>
+
     <div className="max-w-xl mx-auto px-4 mt-4 text-lg text-center text-gray-500 dark:text-zinc-500">
       Meet the next generation of documentation. AI-native, beautiful out-of-the-box, and built for developers.
     </div>