Feature page screenshot and text upgrades (Iteration 2)
Row 1: Merge conflict resolution, activity stream, and file browser Row 2: issue management, issue board, and code snippets Row 3: GitLab CI, Review Apps, and Container Registry Row 4: cycle analytics, Gitlab Pages, and git-powered wiki
Iteration 2 of https://gitlab.com/gitlab-com/marketing/issues/554
cc: @amara