Fixed the broken get started link in index.js

This broke, because of the slug change in intro.mdx.
Aka last commit

Author: LucaVmu

src/pages/index.js

@@ -28,7 +28,7 @@ function HomepageHeader() {
         <div className={styles.button}>
           <Link
             className="button button--secondary button--lg"
-            to="/docs/intro">
+            to="/docs">
             Get Started
           </Link>
         </div>