Help users find where to manage their invite links

[mmbotelho]

Problem

At the moment, invite links are managed in the Group Settings page. However, we never let the user know that they are there, or help them find it.

Solution

A possible solution would be to add a link to the dashboard sidebar, close to the button to "Add members", alerting users that they have active, unused links and that they can click there to see more information.