Docs: Update all articles with the new layout (metadata from the frontmatter)
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
What does this MR do?
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/42831
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Move article's metadata from note to frontmatter -
Update guidelines
EE-version: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4581