[AP-2891] Unlist Browser Use v4 migration guide from sidebar

[bbclanker]

Summary

• Removes v4/migrations/browser-use from the "Migration guide" sidebar group in packages/docs/docs.json.
• The page itself (packages/docs/v4/migrations/browser-use.mdx, added in [STG-2850] Add Browser Use to v4 migration guide #2756 / STG-2850) is unaffected and stays reachable at docs.stagehand.dev/v4/migrations/browser-use via direct link — it's just no longer listed in the sidebar nav.

Test plan

• jq empty packages/docs/docs.json confirms valid JSON
• Confirmed no other docs.json entries or cross-links reference the removed sidebar entry

Requested by: shriya@browserbase.com
Linear: https://linear.app/browserbase/issue/AP-2891/remove-browser-use-v4-migration-guide-from-docs-sidebar

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Latest commit: b16c37f

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[cubic-dev-ai]

cubic analysis

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Linked issue analysis

Linked issue: AP-2891: Remove Browser Use v4 migration guide from docs sidebar

Status	Acceptance criteria	Notes
✅	Remove `v4/migrations/browser-use` from the `Migration guide` sidebar pages array.	The diff removes the entry from the `Migration guide` pages array in `packages/docs/docs.json`.
✅	Keep the Browser Use v4 migration page available by direct URL.	The PR changes only the sidebar configuration; the migration page file is not modified or removed.

_{Re-trigger cubic}