Documentation: simplify layout

docs/_templates/layout.html

 {%- extends "basic/layout.html" %}
 {%- block extrahead %}
   <link rel="stylesheet" type="text/css" href="_static/jiodocs.css">
-  <script type="text/javascript" src="_static/jiodocs.js"></script>
   {{ super() }}
   {% if theme_touch_icon %}
     <link rel="apple-touch-icon" href="{{ pathto('_static/' ~ theme_touch_icon, 1) }}" />
@@ -9,12 +8,3 @@
   <meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9">
 {% endblock %}
 {%- block relbar2 %}{% endblock %}
-{%- block footer %}
-    <div class="footer">
-      &copy; Copyright {{ copyright }}.
-    <a href="https://github.com/nexedi/jio" class="github">
-      <img style="position: absolute; top: 0; right: 0; border: 0;"
-           src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png"
-           alt="Fork me on GitHub">
-    </a>
-{%- endblock %}