Refresh Popular topics on landing page

In support of: gitlab-com/www-gitlab-com#7215 (closed), updates the Popular topics on the main landing page with top pages per a list from Support team.

• Before: https://docs.gitlab.com
• After: http://eread-refresh-popular-topics-landing-page.178.62.207.141.nip.io/index.html