chore: fixing dead links in the docs

[tomkis]

Summary

• Removes or redirects dead links from the docs.
• Removes agents extension overview page

Linked Issues

Fixes #1556

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @tomkis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the quality and reliability of the documentation by systematically identifying and correcting dead or outdated internal links. The changes ensure that users navigating through the documentation are consistently directed to the intended and most current information, thereby improving the overall user experience and reducing frustration from broken references. Additionally, an obsolete overview file has been removed to streamline the documentation structure.

Highlights

• Documentation Link Corrections: Multiple internal links across various documentation files have been updated to point to their correct and current locations, resolving previously dead or incorrect references.
• File Removal: The docs/extensions/overview.mdx file, which provided an overview of extensions, has been removed from the documentation.
• Path Updates: Specific paths for 'Wrap Existing Agents', 'Build New Agent', 'LLM Service', 'Service Extension', 'LLM extension', 'Multi-turn conversations', 'File handling', and 'AgentDetail' extension have been corrected.

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[gemini-code-assist]

Code Review

This pull request addresses several dead links within the documentation by updating URLs, renaming paths, and removing an obsolete overview page. The changes improve the navigation and accuracy of the documentation. I've suggested a couple of minor improvements to enhance link consistency in one of the files. Overall, the changes are good and align with the goal of fixing broken links.