update link to Grunt setup & info

docs/_includes/getting-started/download.html

@@ -13,7 +13,7 @@
     </div>
     <div class="col-sm-4">
       <h3 id="download-source">Source code</h3>
-      <p>Source Less, JavaScript, and font files, along with our docs. <strong>Requires a Less compiler and <a href="{{ site.repo }}#compiling-css-and-javascript">some setup.</a></strong></p>
+      <p>Source Less, JavaScript, and font files, along with our docs. <strong>Requires a Less compiler and <a href="#grunt">some setup.</a></strong></p>
       <p>
         <a href="{{ site.download.source }}" class="btn btn-lg btn-outline" role="button" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download source');">Download source</a>
       </p>