Update outdated style

The style is outdated and differs greatly from about.gitlab.com.

Sid has requested that we give it an update. @dfranca would love your input in this!

Started branch 75-update-outdated-style

@SeanPackham before you get too far on this, I wanted to note that I'm working on rebuilding the site in Nanoc, see https://gitlab-docs-nanoc.gitlab.io/

Mentioned in merge request !38 (merged)

Status changed to closed by merge request !38 (merged)