fix vulnerabilities

[ckingbailey]

There are ~500 vulnerabilities on the various dependencies.

Many can probably be automatically fixed with npm audit fix.

[nydame]

This is so scary! There is a huge potential for breaking things, yet we have to try, don't we? 😫

[ckingbailey]

I got it down to 1. Initial research suggests the way babel-cli works has changed a bit so resolving this one might prove onerous. I'll give it a whirl, and if it requires too many changes, I think it'd be ok to leave it for now. It's severity is low.

[nydame]

Thank you! Feel free to create a pull request whenever you're ready. I've been working on my review-and-deploy-pull-requests workflow, and I'm feeling pretty confident about it now.