Sorry, but you either have no stories or none are selected somehow.
If the problem persists, check the browser console, or the terminal you've run Storybook from.
In the sidebar to the left you will find the different sections that have been created within Sandwich.
The components are set up in a way that makes them generic and thus re-usable, and should beeasily integrated within any React application.
The icons expose a large set of icons, categorized accordingly.
The foundation is the base of the design system and is, as of writing this, still being worked on and improved. The goal of the foundation is to have a one to one connection between the style guide created by the designers and the variables and values defined within the design system.