message: docs(aio): add ngAtlanta to the events page
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diff: <td>London, United Kingdom</td>
  <td>November 07, 2017</td>
  </tr>
  + <!-- ngAtlanta-->
  + <tr>
  + <th><a href="http://ng-atl.org/" title="ngAtlanta">ngAtlanta</a></th>
  + <td>Atlanta, Georgia</td>
  + <td>January 30, 2018</td>
  + </tr>
  </tbody>
  </table>
  </article>
  