Use FontAwesome 4 instead of 5
- Followup from https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/224
- Upgrade to 5 breaks a lot of things (https://fontawesome.com/how-to-use/upgrading-from-4#icon-name-changes-complete-list).
- For now, not worth the change. Reverting to the highest version of FA
Edited by Marcia Ramos