Migrate from percy react to storybook

[nicolaskruchten]

Ugh.

[nicolaskruchten]

Nice job on this! :)

[nicolaskruchten]

What's the command for running the storybook locally? Can you update the readme as well please?

[dmt0]

That would be npm run storybook
I'm not sure, how useful it is to users of this library beside the percy integration. So not sure if we really need it in readme.