vagrant/website/source/layouts/downloads.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("downloads") %>>
          <a href="/downloads.html">Downloads</a>
        </li>
        <li>
          <a href="https://releases.hashicorp.com/vagrant/">Archives</a>
        </li>
      </ul>
    </div>
  <% end %>

  <%= yield %>
<% end %>