Add generated VHS docs screenshots

[murrayju]

Summary

• generate the missing VHS GIFs under docs/images
• update the tape generator and tape outputs to use docs/images
• embed the generated screenshots in the TUI and usage docs

Testing

• ./bun run check

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[Copilot]

Pull request overview

This PR migrates VHS-generated documentation GIFs from docs/assets/ to docs/images/, replaces HTML comment placeholders with actual markdown image embeds in the docs, and enhances generate.sh with automatic ox wrapper creation, VHS binary discovery, and Playwright Chromium fallback.

Changes:

• Moved GIF output directory from docs/assets/ to docs/images/ across all tape files, the generator script, and documentation references
• Replaced <!-- screenshot: ... --> HTML comment placeholders with ![alt](images/...) markdown image embeds in tui.md and usage.md
• Enhanced generate.sh with VHS binary lookup, a temporary ox wrapper script, and Chromium browser fallback logic

Reviewed changes

Copilot reviewed 9 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/usage.md	Added image embed for follow mode
docs/tui.md	Replaced 4 HTML comment placeholders with image embeds
docs/tapes/*.tape (5 files)	Updated Output path from docs/assets/ to docs/images/
docs/tapes/generate.sh	Added VHS discovery, ox wrapper, Chromium fallback, updated output dir
docs/tapes/README.md	Updated references to docs/images/ and documented the ox wrapper
docs/images/*.gif (2 files)	Added generated GIF files

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