Decrease the webpack bundle size (now > 1.6mb)

[bionicles]

trafficstars

Would it be possible to shrink the size of the thebelab bundle?

[minrk]

I'd love to, but it can be tricky. Shimming out unused dependencies is the way to do much of this. codemirror and jupyterlab get pretty darn big, but there are probably new low-hanging fruit since I shimmed out things long ago.