docs: publish captioned YouTube demo

[rabestro]

Summary

• link the README hero and primary screenshot to the published 1:55 YouTube demo
• document the captioned walkthrough and retain the public SRT as an accessibility artifact
• remove the obsolete pre-recording script now that the final demo is published
• keep asset safety guidance current and ignore local macOS and JetBrains metadata

Verification

• npm run check
• npm run build
• git diff --check
• verified the Unlisted video, clickable project links, chapters, and English transcript at https://youtu.be/THanAQS0FvY

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between d2dc992 and 50e73d2.

📒 Files selected for processing (4)

• .gitignore
• README.md
• docs/assets/README.md
• docs/demo-script.md

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud