docs: add remembering users class to nav

        </ul>

      </li>

      <li class="toggle-list">

        <div><a href="<?cs var:toroot ?>training/id-auth/index.html">

            <span class="en">Remembering Users</span>

          </a></div>

        <ul>

          <li><a href="<?cs var:toroot ?>training/id-auth/identify.html">

            <span class="en">Remembering Your User</span>

          </a>

          </li>

          <li><a href="<?cs var:toroot ?>training/id-auth/authenticate.html">

            <span class="en">Authenticating to OAuth2 Services</span>

          </a>

          </li>

          <li><a href="<?cs var:toroot ?>training/id-auth/custom_auth.html">

            <span class="en">Creating a Custom Account Type</span>

          </a>

          </li>

        </ul>

      </li>

      <li class="toggle-list">

        <div><a href="<?cs var:toroot ?>training/sharing/index.html">