AnsibleFest banner for doc site (for the next month or so)

docsite/_themes/srtd/layout.html

@@ -176,6 +176,17 @@
       {# PAGE CONTENT #}
       <div class="wy-nav-content">
         <div class="rst-content">
+
+          <!-- temporary image for AnsibleFest SF --> 
+          <center>
+          <a href="http://http://www.ansible.com/ansiblefest-san-francisco">
+          <img src="http://www.ansible.com/hs-fs/hub/330046/file-1550696672-png/DL_Folder/AF-Top_Banner.png width="500px" height="90px">
+          </a>
+          <br/>&nbsp;<br/>
+          <br/>&nbsp;<br/>
+          </center>
+
+
           {% include "breadcrumbs.html" %}
           <div id="page-content">
           {% block body %}{% endblock %}