docs: solves partially #1617 - basic structure for TS SDK docs

[tomkis]

Summary

A first draft of docs for client SDK.

Linked Issues

Solves #1617

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 lays the groundwork for comprehensive TypeScript SDK documentation by replacing a minimal placeholder with a detailed, multi-page structure. It introduces dedicated sections covering fundamental concepts, architectural overview, API client usage, extension handling, and practical examples, all integrated into the main documentation navigation. This change aims to significantly enhance the clarity and accessibility of information for developers building custom UIs with the AgentStack TypeScript SDK.

Highlights

• TypeScript SDK Documentation Structure: Establishes the initial documentation structure for the TypeScript SDK, replacing a placeholder with a detailed hierarchy of new documentation pages.
• Placeholder Removal: Removes the previous 'client-sdk.mdx' placeholder file, which contained a 'Documentation Coming Soon' note.
• New Documentation Pages: Introduces dedicated '.mdx' files for 'api-client', 'basic-concepts', 'examples', 'extensions', and 'getting-started' within the 'client-sdk' directory, providing specific content areas for the SDK.
• Navigation Update: Integrates the new documentation pages into the 'docs.json' navigation, creating a structured 'Client SDK (Typescript)' group for improved discoverability and organization.

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[gemini-code-assist]

Code Review

This pull request lays the foundational structure for the TypeScript SDK documentation by adding several new markdown files and updating the site navigation. The changes are well-organized. My review includes suggestions to replace a placeholder description, fix a minor grammatical issue for clarity, and address a broken link to ensure the documentation is complete and navigable.