Adjust config files to use doc plugin

src/pages/index.js

@@ -17,7 +17,7 @@ function HomepageHeader() {
                 <div className={styles.buttons}>
                     <Link
                         className="button button--secondary button--lg"
-                        to="/blog">
+                        to="/docs/intro">
                         Zu den Themen!
                     </Link>
                 </div>