[Storybook] publish storybook to github pages

[jasonLaster]

It'd be neat if storybook were published to github pages.

Advantages:

• Users can see our components,
• we can link to them in docs
• eventually we can also publish branches and do visual diffs

Links

• https://getstorybook.io/docs/react-storybook/basics/exporting-storybook
• https://github.com/kadirahq/storybook-deployer
• https://github.com/kadirahq/storybook-deployer

[jasonLaster]

https://github.com/gasolin/ghpage-auto-deploy