Built with the default Sapper template. So look there and to the Sapper docs to understand the structure and function. To get it running:
npm install # or yarn!
cp -r node_modules/material-design-icons-iconfont/ static/material-icons # we're serving it locally
npm run dev
To do anything interesting the app needs a feathersjs scorekeeper server running.
In addition, because Sapper uses server-side rendering, this app uses cookies for storing the authentication token instead of local storage.