Fix Get Started button on homepage

Author: phated

website/static/index.html

@@ -74,7 +74,7 @@ <h2 class="paragraph">
           gulp is a toolkit for automating painful or time-consuming tasks in your development workflow, so you can stop messing around and build something.
         </h2>
         <div class="ctas">
-          <a class="ctas-button" href="https://github.com/gulpjs/gulp/blob/v3.9.1/docs/getting-started.md">Get Started</a>
+          <a class="ctas-button" href="/docs/en/getting-started/quick-start">Get Started</a>
         </div>
       </div>
     </div>