Update dependencies

[davesteinberg]

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[davesteinberg]

I've updated all the dependencies to the latest versions. Next.js updated from 10.x to 11.x, which required one small change to next.config.js, as webpack 5 is now the default.

[davesteinberg]

Deployment was failing with Next 11 because we weren't using the ES Lint plugin. I've fixed that and force-pushed.

I've noticed one more problem: The back navigation from stories to / is broken again. I'll investigate that and update again once it's fixed.