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.

[mergify]

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• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[farzad528]

@vagenas @pablocastro can you review :)

[farzad528]

@vagenas plz merge when ready

[vagenas]

@farzad528 thanks for this nice example! 🙌

In order to align and merge:

1. [CI] DCO check fails, i.e. commits are missing sign-off. To add your sign-off:
   • In your local branch, run: git rebase HEAD~10 --signoff
   • Force push your changes to overwrite the branch: git push --force-with-lease origin main
2. [CI] Code styling fails. To address, install & run the commit hooks locally & push the new changes.
3. I have added some in-line comments to address individual points.

[farzad528]

@vagenas uhhh...i did your rebase command and I think I messed something up as it changed a lot of different files. any advice?

[vagenas]

@farzad528 I see, we 'll try to reshape the branch history into a clean commit (attributing authorship accordingly) & merge this week.