Add ebook link to docsite.

docsite/_themes/srtd/layout.html

@@ -177,15 +177,17 @@
       <div class="wy-nav-content">
         <div class="rst-content">
 
-          <!-- temporary image for AnsibleFest SF --> 
-          <center>
-          <a href="http://www.ansible.com/ansiblefest-london">
-          <img src="http://www.ansible.com/hs-fs/hub/330046/file-1926586843-png/DL_Folder/ANSIBLEFEST_(2).png" width="500px" height="90px">
-          </a>
-          <br/>&nbsp;<br/>
-          <br/>&nbsp;<br/>
-          </center>
-
+<!-- AnsibleFest and free eBook preview stuff -->
+<center>
+<a href="http://www.ansible.com/ansiblefest-london">
+<img src="http://www.ansible.com/hs-fs/hub/330046/file-2031636235-png/DL_Folder/festlondon-docs.png">
+</a>
+<a href="http://www.ansible.com/ansible-book">
+<img src="http://www.ansible.com/hs-fs/hub/330046/file-2031636250-png/DL_Folder/Ebook-docs.png">
+</a>
+<br/>&nbsp;<br/>
+<br/>&nbsp;<br/>
+</center>
 
           {% include "breadcrumbs.html" %}
           <div id="page-content">