update website docs navigation

Author: findkim

website/archive.erb

@@ -9,9 +9,8 @@
         <a class="back" href="/docs/providers/archive/index.html">Archive Provider</a>
       </li>
 
-      <h4>Data Sources</h4>
-
       <li<%= sidebar_current("docs-archive-datasource") %>>
+      <a href="#">"Data Sources"</a>
         <ul class="nav nav-visible">
           <li<%= sidebar_current("docs-archive-datasource-archive-file") %>>
             <a href="/docs/providers/archive/d/archive_file.html">archive_file</a>