message: docs: add ngVikings 2019 to events page
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diff: <td>Gurgaon, India</td>
  <td>February 23, 2019</td>
  </tr>
  + <!-- ngVikings 2019-->
  + <tr>
  + <th><a href="https://ngvikings.org/" title="ngVikings">ngVikings</a></th>
  + <td>Copenhagen, Denmark</td>
  + <td>May 26th Workshops, 27-28 conference, 2019</td>
  + </tr>
  </tbody>
  </table>
  