docs: add Azure AI Search + Azure OpenAI RAG recipe notebook

[farzad528]

Azure AI Search RAG Example Using Docling

This notebook demonstrates how to build a Retrieval Augmented Generation (RAG) system using Docling and Azure AI Search. The example showcases document parsing, chunking, vector search integration, and RAG query implementation.

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• [] Tests have been added, if necessary.

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[farzad528]

@vagenas @pablocastro can you review :)