terraform/website/source/layouts/archive.erb

<% wrap_layout :inner do %>
  <% content_for :sidebar do %>
    <ul class="nav docs-sidenav">
      <li>
        <a class="back" href="/docs/providers/index.html">All Providers</a>
      </li>

      <li<%= sidebar_current("docs-archive-index") %>>
        <a class="back" href="/docs/providers/archive/index.html">Archive Provider</a>
      </li>

      <h4>Data Sources</h4>

      <li<%= sidebar_current("docs-archive-datasource") %>>
        <ul class="nav nav-visible">
          <li<%= sidebar_current("docs-archive-datasource-archive-file") %>>
            <a href="/docs/providers/archive/d/archive_file.html">archive_file</a>
          </li>
        </ul>
      </li>
    </ul>
  <% end %>

  <%= yield %>
<% end %>