docs: fix link on homepage (#949)

Author: B4nan

website/src/pages/index.js

@@ -30,7 +30,7 @@ function Hero() {
                     <div className="row">
                         <div className="col">
                             <div className={styles.heroButtons}>
-                                <Link to="docs" className={styles.getStarted}>Learn more</Link>
+                                <Link to="/docs" className={styles.getStarted}>Learn more</Link>
                                 <iframe src="https://ghbtns.com/github-btn.html?user=apify&repo=apify-cli&type=star&count=true&size=large" frameBorder="0" scrolling="0" width="170" height="30" title="GitHub"></iframe>
                             </div>
                         </div>