About GitLab link in sidebar that links to help page
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/24479
Corresponding CE change: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8316
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/24479
Corresponding CE change: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8316