Fix post: relocate images
I couldn't find its images in the repo, til I checked the frontmatter. They were misplaced. This MR puts them where they originally should be. https://about.gitlab.com/handbook/marketing/blog/#where-to-place-images
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
I couldn't find its images in the repo, til I checked the frontmatter. They were misplaced. This MR puts them where they originally should be. https://about.gitlab.com/handbook/marketing/blog/#where-to-place-images