Fix footer link to respect localized pages (#1040)

Author: JohnTitor

templates/components/footer.hbs

@@ -4,7 +4,7 @@
       <div class="flex flex-column mw8 w-100 measure-wide-l pv2 pv5-m pv2-ns ph4-m ph4-l" id="get-help">
         <h4>{{fluent "footer-get-help"}}</h4>
         <ul>
-          <li><a href="https://doc.rust-lang.org">{{fluent "footer-doc"}}</a></li>
+          <li><a href="{{baseurl}}/learn">{{fluent "footer-doc"}}</a></li>
           <li><a href="https://users.rust-lang.org">{{fluent "footer-ask"}}</a></li>
           <li><a href="http://ping.rust-lang.org">{{fluent "footer-status"}}</a></li>
         </ul>