This PR adds a folder for component docs guidelines for /design (usage guidelines which will eventually become the "overview" section when we have unified docs).
It's behind a folder since it does not need to be highly visible or in the site IA right now) for component do. The intention of this folder is to have a temporary space for component documentation guides (previously called content creation guides) as well as the "MVP" documentation guides, which will help us get to 100% component docs coverage (see EPIC for more detail).