docs: remove legacy browser use images (#5668)

[EloiRamos]

Fixes #5668.

Removes outdated Browser Use screenshots from the documentation and deletes the corresponding
image assets from the docs site. Reference check confirms no remaining links to these images.

Docs-only change.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 275e5de

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[EloiRamos]

Docs-only change.

The Vercel deploy check is expected to fail on forks due to missing authorization.
No functional or runtime code was modified.