Dark mode

[vincerubinetti]

This is based off of #14 . I'll rebase it once that PR is merged so only 32e2a44 remains.

• use first-party @axe-core/playwright instead of axe-playwright
• add type packages for network viz layout algorithms
• add dark mode toggle button and sync with local storage
• add dark mode theme colors
• replace a few hard-coded colors in a few spots with css theme vars
• move testbed network randomized data generation outside component so it only changes on page refresh, not every component re-render
• change "get css var" util funcs to be a reactive hook, which will update on dark mode toggle

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[falquaddoomi]

Neat! Seems pretty straightforward. I tried it out in the Netlify preview and it seemed to work as expected, too.