Update faiss.md

[mbt3777]

This PR updates the documentation for Faiss with enhanced configuration instructions.

[gemini-code-assist]

Summary of Changes

Hello @mbt3777, 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 improves the documentation for the Faiss vector store integration. The update provides users with a complete guide to setting up, configuring, and utilizing Faiss, ensuring a smoother experience and better understanding of its local operation and data persistence mechanisms.

Highlights

• Enhanced Faiss Documentation: Added comprehensive documentation for the Faiss vector store, covering prerequisites, setup, configuration, and verification steps for both local and Docker environments.
• Prerequisite and Setup Instructions: Detailed instructions for installing necessary dependencies for NPM/Source installations on Linux, MacOS, and Windows, alongside clarifying Docker readiness.
• Configuration Guidance: Provided clear guidance on configuring the Faiss node, including the critical 'Base Path' parameter for data persistence and examples for different environments.

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[gemini-code-assist]

Code Review

This pull request significantly improves the documentation for Faiss by replacing the placeholder text with comprehensive setup and usage instructions. The new content is well-structured, clear, and provides valuable information for users. I have one minor suggestion to improve grammatical consistency with other documentation files.