Add transition help section for GitLab.com
On https://www.gitlab.com/gitlab-com/ we should mention import function (with screenshot). The gitlab:import task and the GitHub import thing in recipes.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
On https://www.gitlab.com/gitlab-com/ we should mention import function (with screenshot). The gitlab:import task and the GitHub import thing in recipes.