Product checklists before releasing a new version

When we release a new version of GitLab, and before I update the documentation about this, we need to create a checklist to make sure we don't forget anything product-wise, at it already happened in the past.

• Update https://about.gitlab.com/comparison
• Update https://about.gitlab.com/features/#compare
• Update https://about.gitlab.com/release-list/

What else, @markpundsack @JobV ?