### Description
Enhance the [JavaScript
Quickstart](https://googleapis.github.io/genai-toolbox/getting-started/local_quickstart_js/)
by adding a new tab dedicated to integrating the MCP Toolbox with
LlamaIndex. This provides users with a direct, runnable example of how
to utilize Toolbox's capabilities within a LlamaIndex-powered LLM agent
for hotel search and booking operations.
The changes include:
- Addition of a new `LlamaIndex` tab in `docs/quickstarts/js-local.md`.
- Corresponding `hotelAgent.js` code snippet for LlamaIndex integration.
### Related Issue
This PR addresses and resolves#930.
---------
Signed-off-by: Anushka Saxena <anushka.saxena-it-2k19-05@iips.edu.in>
Co-authored-by: Twisha Bansal <58483338+twishabansal@users.noreply.github.com>
