[Glitch] Change referrer policy to be controlled by header in web UI

Port 425311e1d9 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/getting_started/components/announcements.jsx

@@ -85,7 +85,7 @@ class ContentWithRouter extends ImmutablePureComponent {
       }
 
       link.setAttribute('target', '_blank');
-      link.setAttribute('rel', 'noopener noreferrer');
+      link.setAttribute('rel', 'noopener');
     }
   }