message: Remove encoding & embedded js that breaks htmlhelp builder
diff: <!DOCTYPE html>
  <html class="{{ sphinx_writer }}" lang="{{ lang_attr }}" >
  <head>
  + {% if 'htmlhelp' not in builder %}
  <meta charset="utf-8" />
  + {% endif %}
  {{ metatags }}
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  {% block htmltitle %}
  </div>
  {% include "versions.html" %}
  + {# Do not insert script tag for htmlhelp #}
  + {% if 'htmlhelp' not in builder %}
  <script type="text/javascript">
  jQuery(function () {
  SphinxRtdTheme.Navigation.enable({{ 'true' if theme_sticky_navigation|tobool else 'false' }});
  });
  </script>
  + {% endif %}
  {# Do not conflict with RTD insertion of analytics script #}
  {% if not READTHEDOCS %}
  