Hi, this is the root of the government-frontend application. This page is intended to be shown in development and on Heroku review apps. It won't be shown to users on GOV.UK because there are no routes to it.
To see the available components, take a look at the component guide.
The content schemas contain handmade examples for each schema rendered by this app. These are used in tests.dummy content store.
Examples from GOV.UK
These pages are used to run visual regression tests. They're good examples of the types of pages rendered by this application.