don't download non-HTML pages

[JaneJeon]

This should close #793

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Name	Status	Preview	Comments	Updated (UTC)
blink	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 19, 2023 4:53pm

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Deploying with    Cloudflare Pages

Latest commit:	64efd7a
Status:	✅  Deploy successful!
Preview URL:	https://43148bc3.blink.pages.dev
Branch Preview URL:	https://fix-got.blink.pages.dev

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