chore: update site

Author: antfu

site/index.html

@@ -56,6 +56,10 @@ <h1>Collection of TypeScript type challenges with online judge</h1>
           <a href="https://github.com/type-challenges/type-challenges" class="button"> View on Github </a>
         </p>
       </div>
+
+      <a href="https://www.netlify.com" class="netlify">
+        <img src="/netlify.svg" alt="Deploys by Netlify" />
+      </a>
     </main>
   </body>
 </html>