docs: add Browserless integration guide

[xsvfat]

Summary

• Adds a new integration doc (docs/integrations/browserless.mdx) for using AgentKit with Browserless headless browser infrastructure
• Includes a complete Hacker News scraping example using Playwright's CDP connection to Browserless
• Documents advanced features: stealth mode, residential proxies, and regional endpoints
• Adds the new page to the docs sidebar in docs.json

Details

This follows the same MDX structure and conventions as the existing Browserbase integration doc. The guide covers:

1. Installing dependencies
2. Setting up an Agent and Network
3. Creating a Browserless tool with chromium.connectOverCDP()
4. Advanced features (stealth, proxies, regional endpoints)

Reference: https://docs.browserless.io/ai-integrations/agentkit

Test plan

• Verify the MDX renders correctly in the Mintlify docs
• Confirm sidebar navigation includes the new Browserless page
• Test all code examples for correctness

🤖 Generated with Claude Code

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Latest commit: 862246b

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