feat: respect esbuild minify config for css

[sapphi-red]

resolve #540 https://github.com/vitejs/vite/commit/d90409e2afa91c34d124a28b8c9cadc915815617 の反映です

[netlify[bot]]

✅ Deploy Preview for vitejs-docs-ja ready!

Name	Link
🔨 Latest commit	f08c6e59a7620add3722d316b2145ad0359c9651
🔍 Latest deploy log	https://app.netlify.com/sites/vitejs-docs-ja/deploys/62e640fc0865f80009067540
😎 Deploy Preview	https://deploy-preview-633--vitejs-docs-ja.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.