React 18 + migration on Emotion

[turansky]

React 18:

• react.dom.render -> react.dom.client.createRoot

Emotion (instead of kotlin-react-css):

• react.css.css -> emotion.react.css

[jfontsaballs]

Chapter 3 from the React tutorial, in line 184 and following recommends using kotlin-react-css which has been removed from kotlin-wrappers (see the release notes). Please modify this tutorial with updated best practices.