docs: preload page thumbnail if set #39769
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Note that it expects the normal non-2x image in the front matter and a 2x image must be present too.
Previews:
The real gain might not be noticeable in the previews, because Netlify doesn't cache aggressively the assets like Cloudflare does. But on production, the difference should be noticeable.
This along with #39768 and #39824 should make these pages load significantly faster.
TODO: