message: explain why we have to split up the CSS import and <link>
diff: @@ -26,6 +26,7 @@ export default class MyDocument extends Document {
  <meta charSet="utf8" />
  <link rel="icon" href={asset('/static/assets/favicon.png')} />
  <link rel="apple-touch-icon" href={asset('/static/assets/apple-touch-icon.png')} />
  + {/* See: https://github.com/zeit/next-plugins/tree/master/packages/next-sass#usage */}
  <link rel="stylesheet" href={asset('/_next/static/style.css')} />
  <meta name="viewport" content="width=device-width,initial-scale=1" />
  <meta name="generator" content="Compositor X0" />
  