Fix modernizr url

If we are in a subdirectory it's not working anymore because the path of modernizr is all time _static/...

Author: bport

sphinx_rtd_theme/layout.html

@@ -75,7 +75,7 @@
   {%- block extrahead %} {% endblock %}
 
   {# Keep modernizr in head - http://modernizr.com/docs/#installing #}
-  <script src="_static/js/modernizr.min.js"></script>
+  <script src="{{ pathto('_static/js/modernizr.min.js', 1) }}"></script>
 
 </head>