docs: translate documents to ko_KR

[inseong01]

• Created ko_KR directory for Korean translations

• Translated .md and .html files into Korean

• Updated links from en to ko when Korean content is available

  • intentionally retained original links: chunked transfer encoding, XMLHttpRequest.responseType

Checklist

• I have ensured my pull request is not behind the main or master branch of the original repository.
• I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• I have written a commit message that passes commitlint linting.
• I have ensured that my code changes pass linting tests.
• I have ensured that my code changes pass unit tests.
• I have described my pull request and the reasons for code changes along with context if necessary.