Remove use of nwb build tool

[heatherbooker]

Closes #93 - Move away from nwb, the magical build tool.

• Add npm keywords for users to find the package more easily
• Replace nwb with webpack and babel
• Use two separate webpack configs for demo vs. actual component
• Move devDependencies where they belong
• Remove the unused react-highlight.js package

@dharness Can you have a good look? I'm not entirely confident about this.

[dharness]

@heatherbooker there's got to be a way to publish from a branch to npm and see if we can install it - that would give me a lot more confidence

[dharness]

This is nice 👍 I'm going to have to checkout and try it to confirm it all works though

[heatherbooker]

there's got to be a way to publish from a branch to npm and see if we can install it - that would give me a lot more confidence

Yeah eh? Agreed. Maybe npm pack, scroll down here? https://medium.com/@vcarl/problems-with-npm-link-and-an-alternative-4dbdd3e66811

[heatherbooker]

@dharness Could you check this one out again? (rebased to fix conflicts, would like to mergeeeee)