Use jsdom instead of Puppeteer / headless Chrome for graph generation

[dreeves]

Desiderata

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1. Try it and see

We tried this in the past and it didn't work (or was too ugly?) but it's been long enough it's worth trying again. It could potentially save us a ton in server costs.

Cognata

• Mega-gissue: everything from TODO.md #285
• Puppeteer needs environment variables set #264
• Can we generate images from Safari and Firefox's SVG renderer? #179
• Don't add event listeners for headless graph generation #144

Verbata: speed of graph generation, faster graph generation, generating SVGs without a browser,

[adamwolf]

Take a look at satori and resvg, too.