docs: use `opengraph-image.tsx` for OG images in blog

[anthonyshew]

Description

No need to make an API call when we can just use opengraph-image.tsx

Testing Instructions

Take a look at OG images that are getting generated for blog pages.

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Project	Deployment	Preview	Comments	Updated (UTC)
examples-basic-web	Ready	Preview	Comment	Oct 21, 2025 3:41pm
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[anthonyshew]

⚠️ The new strategy is breaking when deployed. Need to fix.