Eighth Korean l10n work for release 1.18

- Translate tasks/administer-cluster/declare-network-policy in Korean (#22526)
- Translate tasks/debug-application-cluster/debug-init-containers in Korean (#22608)
- Fix a missing markdown syntax to enable external link (#22661)
- Translate tasks/administer-cluster/change-pv-reclaim-policy in Korean (#22551)
- Update docs/contribute/participate/ for Korean (#22605)
- Update outdated files in dev-1.18-ko.8 (#22466)
- Translate tasks/administer-cluster/dns-custom-nameservers in Korean (#22524)

Co-authored-by: Daehyun Paik <paik@a30a.dev>
Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: bluefriday <bluefriday86@gmail.com>
Co-authored-by: June Yi <june.yi@samsung.com>
Co-authored-by: Jesang Myung <jesang.myung@gmail.com>
Co-authored-by: Seokho Son <shsongist@gmail.com>

content/ko/docs/contribute/_index.md

@@ -3,6 +3,7 @@ content_type: concept
 title: 쿠버네티스 문서에 기여하기
 linktitle: 기여
 main_menu: true
+no_list: true
 weight: 80
 card:
   name: contribute
@@ -23,8 +24,6 @@ card:
 
 쿠버네티스 문서는 새롭고 경험이 풍부한 모든 기여자의 개선을 환영합니다!
 
-
-
 <!-- body -->
 
 ## 시작하기