Purpose of the change

This PR introduces the official LlamaIndex integration guide to the documentation site. It migrates the existing technical instructions from the repository into a high-quality, Mintlify-formatted .mdx page, ensuring developers have a clear path to implementing persistent memory within LlamaIndex chat engines.

Description

Converted the examples/llamaindex/guide.md into a structured, production-ready documentation page.

• Renaming Alignment: Updated all installation and import references to use memmachine-client instead of the legacy memmachine package name to align with the current renaming effort.
• Component Implementation: Leveraged <Steps> for initialization flow and <Note> for technical best practices.
• Standardization: Updated the configuration tables to use consistent terminology (org_id, project_id, user_id) to match other framework guides.
• Integration Discovery: Added the LlamaIndex card to the main introduction.mdx landing page.

Dependencies: Requires memmachine-client and llama-index.

Fixes/Closes

Fixes #1041

Type of change

• Documentation update

How Has This Been Tested?

• Manual verification (list step-by-step instructions)

Test Steps:

1. Rendering Check: Verified the .mdx file renders correctly via Mintlify, ensuring the table formatting and <Steps> components are visually sound.
2. Technical Verification: Validated that the memmachine-client installation command is accurate for the current repository state.
3. Snippet Review: Confirmed that the MemMachineMemory initialization parameters in the code snippets match the environment variables listed in the configuration table.

Test Results: Documentation is consistent with the guide.md source logic.

Checklist

• I have signed the commit(s) within this pull request
• My code follows the style guidelines of this project (See STYLE_GUIDE.md)
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have checked my code and corrected any misspellings

Maintainer Checklist

• Confirmed all checks passed
• Contributor has signed the commit(s)
• Reviewed the code
• Run, Tested, and Verified the change(s) work as expected

Screenshots/Gifs

Screenshot 1: LlamaIndex.mdx (1 of 3):

Screenshot 2: LlamaIndex.mdx (2 of 3):

Screenshot 3: LlamaIndex.mdx (3 of 3):

Screenshot 4: introduction.mdx showing our updated Integrations Cards Including LlamaIndex (1 of 1):

Further comments

Note for reviewers: The choice to use memmachine-client in the pip install instructions is intentional to support the ongoing package renaming effort.