Add first Korean cookbook

[harheem]

What does this PR do?

This PR represents the first step in adding Korean content to the Open-Source AI Cookbook. The main changes are as follows:

1. Created 'ko' directory: A new 'ko' directory has been added under the notebooks folder to house Korean content.
2. Added Korean Advanced RAG notebook: This notebook introduces advanced RAG (Retrieval-Augmented Generation) techniques to Korean-speaking users.
3. Created table of contents and index files:
   • Generated the notebooks/ko/_toctree.yml file.
   • Added the notebooks/ko/index.md file.
4. Updated workflow files: Added the 'ko' language code to build_documentation.yml and build_pr_documentation.yml files in the .github/workflows folder.

Who can review?

@jungnerd, @heuristicwave, @junejae, @nuatmochoi

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merveenoyan commented on 2024-07-03T11:50:00Z
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Can we find a Korean one for consistency?

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merveenoyan commented on 2024-07-03T11:50:00Z
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no need to make numbered headings

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merveenoyan commented on 2024-07-03T11:50:01Z
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maybe printing a few as an example would look better

[merveenoyan]

Very comprehensive, gomapseumnida! 🤗
Would be great for a Korean speaking reviewer to skim through it. Left two small nits, reviewed through autotranslation in browser.

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jungnerd commented on 2024-07-04T01:54:29Z
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저장: 성된 임베딩 ...

There is a typo.

I think '저장: 완성된 임베딩 ...' is the correct sentence.