Make react recipes compatible with try-purescript

[milesfrain]

Fixes #196

I you open the dev console, you'll find this warning from react-dom.development.js

Warning: render(): Rendering components directly into document.body is discouraged, since its children are often manipulated by third-party scripts and browser extensions. This may lead to subtle reconciliation issues. Try rendering into a container element created for your app.

But this is the same as what Halogen does, so I don't think we need to be concerned.

[maddie927]

This version does not warn: react demo

[maddie927]

Cleaned it up a little more here (should've cleaned up the other links too, sorry 😅 )

[milesfrain]

Wondering if it makes sense to add createRootElement to a library to keep these examples compact.

[JordanMartinez]

Thanks!