fix: top two hero cards not clickable (#1499)

Author: dks333

index.mdx

@@ -37,7 +37,7 @@ export const HeroCard = ({ filename, title, description, href }) => {
     />
   </div>
 
-  <div className="px-4 py-16 lg:py-48 lg:pb-24 max-w-3xl mx-auto">
+  <div className="relative z-10 px-4 py-16 lg:py-48 lg:pb-24 max-w-3xl mx-auto">
     <h1 className="block text-4xl font-medium text-center text-gray-900 dark:text-zinc-50 tracking-tight">
       Documentation
     </h1>