fix(books): free-programming-books-ko broken link (#6956)

Author: LuigiImVector

Diff for: books/free-programming-books-ko.md

@@ -120,7 +120,7 @@
 
 ### Linux
 
-* [리눅스 서버를 다루는 기술](https://thebook.io/006718/)
+* [리눅스 서버를 다루는 기술](https://web.archive.org/web/20220107111504/https://thebook.io/006718/) *(:card_file_box: archived)*
 * [GNOME 배우기](https://sites.google.com/site/gnomekr/home/learning_gnome)