This page is simply a parent for all the style guide sections of the site. Pages that showcase templates, typography, etc should all be accessible within this page’s level.
Style guides are particularly useful for development and content entry. The goal of a style guide is to provide a reference of any and all aspects of the sites design. Buttons, typography, menus, lists, spacing, etc should all be represented here.
It would be a good idea to place a menu here that links to every sub page of the style guide.