Switch to side-by-side view

--- a/website/doc.html
+++ b/website/doc.html
@@ -45,6 +45,9 @@
       <ul>
       <li><a href="perfs.html">Index size and indexing performance
 	      data.</a></li> 
+      <li><a href="howtos/index.html"><em>How to</em></a>
+	documents. These describe in detail how to perform a number of
+	specific tasks.</li>
       </ul>