Update OG images and icons

[mdo]

Forgot to push this into #648.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
pierre-docs-diffshub	Ready	Preview	May 7, 2026 9:08pm
pierre-docs-trees	Ready	Preview	May 7, 2026 9:08pm
pierrejs-diff-demo	Ready	Preview	May 7, 2026 9:08pm
pierrejs-docs	Ready	Preview	May 7, 2026 9:08pm

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/pierrecomputer/pierre/blob/4a0e811982becae5aaded8c2260480cf3e7cbd0f/apps/docs/public/diffshub-brand/icon.png#L1
Keep referenced diffshub PNG favicon in public assets

Removing apps/docs/public/diffshub-brand/icon.png introduces a broken metadata asset because the diffshub site still declares '/diffshub-brand/icon.png' in SITE_ICONS_BY_SITE.diffshub (apps/docs/app/layout.tsx, around line 136). In environments serving this metadata, clients requesting that icon now get a 404, so the favicon/icon set is incomplete unless the reference is updated to the new .ico file or the PNG is restored.

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