message: docs: updated collaborators and add angular dev's link
  Existing trusted collaborators link is not working and now link is updated to one of angular.io page also it was missing angular dev's link so added it.
  Closes
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diff: # Contributors page
  -We have an official accounting of who is on the Angular Team, who are "trusted collaborators" (see https://team.angular.io/collaborators), and so on.
  +We have an official accounting of who is on the Angular Team (see https://angular.io/about?group=Angular), who are "trusted collaborators" (see https://angular.io/about?group=Collaborators), and so on.
  The `contributors.json` should be maintained to keep our "org chart" in a single consistent place.
  