terraform/website/source/layouts/atlas.erb

<% wrap_layout :inner do %>
  <% content_for :sidebar do %>
    <div class="docs-sidebar hidden-print affix-top" role="complementary">
      <ul class="nav docs-sidenav">
        <li<%= sidebar_current("docs-home") %>>
          <a href="/docs/providers/index.html">All Providers</a>
        </li>
        <li<%= sidebar_current("docs-atlas-index") %>>
          <a href="/docs/providers/atlas/index.html">Atlas Provider</a>
        </li>
        <li<%= sidebar_current("docs-atlas-data") %>>
        <a href="#">Data</a>
        <ul class="nav nav-visible">
          <li<%= sidebar_current("docs-atlas-data-artifact") %>>
            <a href="/docs/providers/atlas/d/artifact.html">atlas_artifact</a>
          </li>
        </ul>
        </li>
        <li<%= sidebar_current("docs-atlas-resource") %>>
          <a href="#">Resources</a>
          <ul class="nav nav-visible">
            <li<%= sidebar_current("docs-atlas-resource-artifact") %>>
              <a href="/docs/providers/atlas/r/artifact.html">atlas_artifact</a>
            </li>
          </ul>
        </li>
      </ul>
    </div>
  <% end %>

  <%= yield %>
<% end %>