feat(tavily): Align Tavily Python and Typescript docs

[Lakshya Agarwal (lakshyaag-tavily)]

Overview

This PR updates the documentation in both languages (Python, TypeScript) for Tavily. It aligns the Tavily Python and JS integration docs so both languages cover the full langchain-tavily / @langchain/tavily surface.

Type of change

Type:

• New documentation page
• Update existing documentation
• Remove outdated content

Checklist

• I have read the contributing guidelines, including the language policy
• I have tested my changes locally using docs dev
• All code examples have been tested and work correctly
• I have used root relative paths for internal links
• I have updated navigation in src/docs.json if needed

[github-actions]

Thanks for opening a docs PR, Lakshya Agarwal (@lakshyaag-tavily)! When it's ready for review, please add the relevant reviewers:

• @npentrel or @lnhsingh (JavaScript integrations)
• @mdrxy (Python integrations)

[Lakshya Agarwal (lakshyaag-tavily)]

• Naomi Pentrel (@npentrel) for JavaScript
• Mason Daugherty (@mdrxy) for Python