terraform/website/source/layouts/atlas.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-atlas-index") %>>
        <a class="back" href="/docs/providers/atlas/index.html">Atlas Provider</a>
      </li>

      <h4>Data Sources</h4>

      <li<%= sidebar_current("docs-atlas-data") %>>
        <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>

      <h4>Resources</h4>

      <li<%= sidebar_current("docs-atlas-resource") %>>
        <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>
  <% end %>

  <%= yield %>
<% end %>