Link to homepage from blog index
On https://www.gitlab.com/blog/ the top left should not be GitLab.com Blog but GitLab.com and it should link to the homepage.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
On https://www.gitlab.com/blog/ the top left should not be GitLab.com Blog but GitLab.com and it should link to the homepage.