Docs: refactor Pages index
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
What does this MR do?
Ports https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15411 to EE.
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
Ports https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15411 to EE.