{%- assign files = site.static_files | where: "extname", ".html" -%}
    {%- if files.size > 0 %}    <ul>
      {%- for file in files -%}
        {%- assign path = file.path | remove_first: page.url | remove_first: "/index.html" %}
      <li>
        <a href="{{- path | append: "/" -}}">{{- path -}}</a>
      </li>
      {%- endfor %}
    </ul>
    {%- endif %}