Modifying HTML header in docs to add link suggested by Karel.

src/doc/header.html

@@ -23,7 +23,7 @@ $mathjax
  <tbody>
  <tr style="height: 56px;">
   <!--BEGIN PROJECT_LOGO-->
-  <td id="projectlogo"><img alt="Logo" src="$relpath$$projectlogo"/ style="padding: 3px 5px 1px 5px"></td>
+ <td id="projectlogo"><a href="http://kaldi-asr.org/"><img alt="Logo" src="$relpath$$projectlogo"/ style="padding: 3px 5px 1px 5px"></a></td>
   <!--END PROJECT_LOGO-->
   <!--BEGIN PROJECT_NAME-->
   <td style="padding-left: 0.5em;">