docs: add Browserless.io documentation link to tools list

[millerphp]

Background

The AI SDK documentation currently lists various toolkits and integrations, including browser-related tools. Browserless.io provides a robust browser automation service with AI integration capabilities, and its documentation should be included alongside other similar tools to help developers discover and utilize this resource.

Summary

This PR adds the Browserless.io documentation link to the tools list in content/docs/02-foundations/04-tools.mdx. The addition:

• Maintains consistent formatting with existing entries
• Places the entry logically after Browserbase (another browser-related tool)
• Provides a clear, concise description of Browserless.io's capabilities

Tasks

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• If required, a patch changeset for relevant packages has been added
• You've run pnpm prettier-fix to fix any formatting issues

Future Work

• Consider adding more detailed examples of Browserless.io integration with the AI SDK
• Explore potential collaboration on additional documentation or examples
• Investigate opportunities for deeper integration between Browserless.io and the AI SDK

[lgrammel]

I cannot update the PR with the latest. Please enable PR edits by owners or update to latest.

[millerphp]

@lgrammel apologies for the delay - have updated this. if it ends up out of sync again, do let me know - i can probably find out how to grant you edit access