Port example to use create-react-app

[roman1Fox]

@dsblv commented on Fri Oct 14 2016

Hello!

I guess there's no need to explain now what create-react-app is and why it's nice to have examples using it. Hope it'll help newcomers like me to get started with react-art a bit quicker.

I noticed that this change will break gh-pages website build step. I'd like to fix that. Is it better done in another PR or this one?

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