Added links to korean docs (#5837)

* Implemented code of conduct korean translation

* Implemented CONTRIBUTING korean translation

* Implemented HOWTO korean translation

* Added English link

* Reverted MD syntax formatting

* Revert MD syntax

* Added HOWTO-kr links

* Fixed new line & anchors

* Fixed CoC

* chore(docs): fix all annoying markdown problems

Finish review EbookFoundation/free-programming-books#5837

* chore(docs): fix all annoying markdown problems

Finish review EbookFoundation/free-programming-books#5837

* Removed duplicated korean translation

* Revert bad md formatting

* Fixed inconsistencies

* Fixed indentation

* Added missing korean links

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

CONTRIBUTING-id.md

@@ -1,4 +1,4 @@
-*Instruksi ini dalam bahasa lain: [Deutsch](CONTRIBUTING-de.md), [English](CONTRIBUTING.md),[Español](CONTRIBUTING-es.md), [Français](CONTRIBUTING-fr.md), [简体中文](CONTRIBUTING-zh.md), [繁體中文](CONTRIBUTING-zh_TW.md), [فارسی](CONTRIBUTING-fa_IR.md), [Tiếng Việt](CONTRIBUTING-vn.md), [Русский](CONTRIBUTING-ru.md), [Português Brasileiro](CONTRIBUTING-pt_BR.md).*
+*Instruksi ini dalam bahasa lain: [Deutsch](CONTRIBUTING-de.md), [English](CONTRIBUTING.md),[Español](CONTRIBUTING-es.md), [Français](CONTRIBUTING-fr.md), [简体中文](CONTRIBUTING-zh.md), [繁體中文](CONTRIBUTING-zh_TW.md), [فارسی](CONTRIBUTING-fa_IR.md), [Tiếng Việt](CONTRIBUTING-vn.md), [Русский](CONTRIBUTING-ru.md), [Português Brasileiro](CONTRIBUTING-pt_BR.md), [한국어](CONTRIBUTING-ko.md).*
 
 ## Perjanjian lisensi kontributor
 Dengan kerja sama Anda, Anda menerima [lisensi](https://github.com/EbookFoundation/free-programming-books/blob/master/LICENSE) dari repositori ini.