Improve the Knowledge Graphs cookbook

[MRiabov]

Hello,
I'm only learning, but the graph tutorial seems a little too simplistic. We are working with tiny document sizes (names and titles of the papers), and while the graph itself is OK, I think it is valuable to add larger-size documents to the cookbook. Perhaps a tighter integration with something like Agent RAG is also desirable.

Technically, yes, larger document sizes just add a level of abstraction, but with graph+RAG document analysis/generation being popular (including code gen) I think it makes sense to create a cookbook which would support more powerful use-cases.
Cheers.

[MRiabov]

Also, how to build knowledge graphs at scale is also interesting.