feat: Add Multimodal RAG cookbook

[sjrl]

• fixes Create Image Indexing Example haystack#9321

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[sjrl]

@bilgeyucel this is ready for review!

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anakin87 commented on 2025-07-22T13:40:17Z
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I would also explain that in the following Pipeline we are:

• computing embeddings based on images for image files
• converting PDF files to textual Documents and then computing embeddings based on the text

sjrl commented on 2025-07-23T11:27:00Z
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sounds good!

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anakin87 commented on 2025-07-22T13:40:17Z
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Is it worth mentioning that other models (Jina Embeddings 4) might work better?

sjrl commented on 2025-07-23T11:27:23Z
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Yeah I was thinking about that. I'll mention that here.

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anakin87 commented on 2025-07-22T13:40:18Z
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Something seems off in the first sentence.

[anakin87]

Nice work! I left some comments (while waiting on a review from @bilgeyucel)

We should also create a new entry in index.toml.

[sjrl]

sounds good!

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[sjrl]

Yeah I was thinking about that. I'll mention that here.

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