Convert to fully-static site, Part 1: Use Netlify and update CI

[duckinator]

As part of making Parts Horse more sustainable long-term, I'm converting it to a fully-static site.

This PR configures it for using Netlify, and makes some CI changes.

[netlify[bot]]

✅ Deploy Preview for parts-horse ready!

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🔨 Latest commit	f3503501ffd309954ffc5fe85c5e9fa2f025c4c6
🔍 Latest deploy log	https://app.netlify.com/sites/parts-horse/deploys/62425f636d880200085e510f
😎 Deploy Preview	https://deploy-preview-114--parts-horse.netlify.app
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[duckinator]

bors r+

[bors[bot]]

Timed out.

[duckinator]

bors r+

[bors[bot]]

Canceled.

[duckinator]

bors r+

[bors[bot]]

Build succeeded:

• CI success