message: fix(docs-infra): add visual signal for external links
  Clicking on a link may take us to an extenal source, which may lead to user leaving angular.io unintentionally.
  Added visual cues on external links so that user knows which links are external and which are intenal to angular.io.
  Fixes
  PR Close
diff: @@ -192,3 +192,32 @@ code {
  color: $mediumgray;
  }
  }
  +
  +.folder-api,
  +.folder-cli,
  +.folder-docs,
  +.folder-guide,
  +.folder-start,
  +.folder-tutorial {
  +
  + aio-doc-viewer{
  + a {
  + &[href^="http:"]::after,
  + &[href^="https:"]::after {
  + font-family: "Material Icons";
  + content: "open_in_new";
  + margin-left: 2px;
  + position: relative;
  + @include line-height(24);
  + vertical-align: bottom;
  + }
  + }
  +
  + .github-links a {
  + &[href^="http:"]::after,
  + &[href^="https:"]::after {
  + display: none;
  + }
  + }
  + }
  +}
  