Add nav bar link for korean translation

[FacerAin]

@koreyspace Hello, Thank you for reviewing the Korean translation for Korean users. This PR is to add a navigation bar link for selecting the Korean translation on the website. Thanks! 😊

related PR: https://github.com/microsoft/generative-ai-for-beginners/pull/271

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./05-advanced-prompts/translations/ko/README.md	1. ../../solution.py
./08-building-search-applications/translations/ko/README.md	1. ../../solution.ipynb
./07-building-chat-applications/translations/ko/README.md	1. ../../notebook-openai.ipynb 2. ../../notebook-azure-openai.ipynb 3. ../../notebook-azure-openai.ipynb

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