docs: refresh and improve the "named data" sphinx theme

Change-Id: I196c30f84ce4edd5cd10dfe3cab6ea2dc6947815
diff --git a/docs/named_data_theme/layout.html b/docs/named_data_theme/layout.html
index c9fb5c1..a7aa464 100644
--- a/docs/named_data_theme/layout.html
+++ b/docs/named_data_theme/layout.html
@@ -1,85 +1,45 @@
 {#
     named_data_theme/layout.html
-    ~~~~~~~~~~~~~~~~~
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 #}
-{% extends "basic/layout.html" %}
+{%- extends "agogo/layout.html" %}
 
 {% block header %}
-    <!--headercontainer-->
     <div id="header_container">
-
-        <!--header-->
-        <div class="row">
-             <div class="three columns">
-                  <div id="logo">
-                        <a href="https://named-data.net" title="A Future Internet Architecture"><img src="https://named-data.net/wp-content/uploads/cropped-20130722_Logo2.png" alt="" /></a>
-                  </div><!--logo end-->
-             </div>
-
-             <!--top menu-->
-             <div class="nine columns" id="menu_container" >
-               <h1><a href="{{ pathto(master_doc) }}">{{ shorttitle|e }}</a></h1>
-             </div>
+      <div class="row">
+        <div class="three columns">
+          <p class="logo"><a href="https://named-data.net" title="A Future Internet Architecture">
+            <img class="logo" src="{{ pathto('_static/ndn-logo.svg', 1)|e }}" alt="Logo" width="210"/>
+          </a></p>
         </div>
-    </div><!--header container end-->
-
-{% endblock %}
-
-{% block content %}
-    <div class="content-wrapper">
-      <div class="content">
-        <div class="document">
-          {%- block document %}
-            {{ super() }}
-          {%- endblock %}
+        <div id="menu_container" class="nine columns">
+          <h1><a href="{{ pathto(master_doc)|e }}">{{ shorttitle|e }}</a></h1>
         </div>
-        <div class="sidebar">
-          {%- block sidebartoc %}
-          <h3>{{ _('Table Of Contents') }}</h3>
-          {{ toctree(includehidden=True) }}
-
-          <h3>{{ _('Additional documentation') }}</h3>
-          <ul>
-            <li class="toctree-l1"><a class="reference external" href="https://redmine.named-data.net/projects/nfd/wiki">NFD Wiki</a></li>
-            <li class="toctree-l1"><a class="reference internal" href="doxygen/annotated.html">API documentation (doxygen)</a></li>
-          </ul>
-          {%- endblock %}
-          {%- block sidebarsearch %}
-          <h3 style="margin-top: 1.5em;">{{ _('Search') }}</h3>
-          <form class="search" action="{{ pathto('search') }}" method="get">
-            <input type="text" name="q" />
-            <input type="submit" value="{{ _('Go') }}" />
-            <input type="hidden" name="check_keywords" value="yes" />
-            <input type="hidden" name="area" value="default" />
-          </form>
-          <p class="searchtip" style="font-size: 90%">
-            {{ _('Enter search terms or a module, class or function name.') }}
-          </p>
-          {%- endblock %}
-        </div>
-        <div class="clearer"></div>
       </div>
     </div>
 {% endblock %}
 
+{%- block sidebartoc %}
+    <h3>{{ _('Table of Contents') }}</h3>
+    {{ toctree(includehidden=True) }}
+    <h3>{{ _('Additional Documentation') }}</h3>
+    <ul>
+      <li class="toctree-l1"><a class="reference internal" href="doxygen/annotated.html">API Documentation (doxygen)</a></li>
+      <li class="toctree-l1"><a class="reference external" href="https://redmine.named-data.net/projects/nfd/wiki">NFD Wiki</a></li>
+    </ul>
+{%- endblock %}
+
 {% block footer %}
     <div id="footer-container">
-        <!--footer container-->
-        <div class="row">
-        </div><!-- footer container-->
     </div>
-
     <div id="footer-info">
-        <!--footer container-->
-        <div class="row">
-            <div class="twelve columns">
-
-                <div id="copyright">This research is partially supported by NSF (Award <a href="http://www.nsf.gov/awardsearch/showAward?AWD_ID=1040868" target="_blank>">CNS-1040868</a>)<br/><br/><a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.en_US" target="_blank">Creative Commons Attribution 3.0 Unported License</a> except where noted.</div>
-
-            </div>
+      <div class="row">
+        <div class="twelve columns">
+          <div id="copyright">
+            This research is partially supported by NSF (Award <a href="http://www.nsf.gov/awardsearch/showAward?AWD_ID=1040868" target="_blank">CNS-1040868</a>).<br/><br/>
+            Licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/3.0/" target="_blank">Creative Commons Attribution 3.0 Unported License</a> except where noted.
+          </div>
         </div>
-    </div><!--footer info end-->
+      </div>
+    </div>
 {% endblock %}
-
-{% block relbar1 %}{% endblock %}
-{% block relbar2 %}{% endblock %}