docs: update homepage promo YouTube link

[toddgeist]

Summary

• Replace the homepage hero promo video URL with the new YouTube link.
• Update the tracked promo video ID to keep analytics metadata aligned.

Test plan

• Run npx pnpm@10.27.0 run ci
• Confirm apps/docs/src/components/HeroPromoVideo.tsx uses https://youtu.be/dj3fn3RKeQ0

Summary by CodeRabbit

• Documentation
  • Updated the promotional video featured on the documentation site

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Project	Deployment	Actions	Updated (UTC)
proofkit-docs	Ready	Preview, Comment	May 12, 2026 3:11pm

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 1a91a9ae-d58f-4237-a3ff-975dcaf347f7

📥 Commits

Reviewing files that changed from the base of the PR and between 8dd3892 and 6279a6d.

📒 Files selected for processing (1)

• apps/docs/src/components/HeroPromoVideo.tsx

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📝 Walkthrough

Walkthrough

The promo video embedded in the HeroPromoVideo component is updated by replacing the hardcoded YouTube URL and video ID constants with new values, affecting all downstream tracking and embed-src generation that references these constants.

Changes

Promo Video Reference Update

Layer / File(s)	Summary
Promo video constants update apps/docs/src/components/HeroPromoVideo.tsx	PROMO_VIDEO_URL and PROMO_VIDEO_ID constants are replaced with new YouTube video references, updating the embedded video and all downstream analytics and embed logic.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• proofsh/proofkit#255: Updates the same promo video constants in HeroPromoVideo.tsx.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating the homepage promo YouTube link in the HeroPromoVideo component.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-youtube-link

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commit: 6279a6d