mirrors: remove maakpain.

Mirror maintaner is unsure about long term maintenance.

Author: ericonr

src/xbps/repositories/mirrors/index.md

@@ -33,7 +33,6 @@ sub-repository.
 | <https://mirrors.cnnic.cn/voidlinux/>              | Asia: China       |
 | <https://mirrors.tuna.tsinghua.edu.cn/voidlinux/>  | Asia: China       |
 | <https://mirror.sjtu.edu.cn/voidlinux/>            | Asia: China       |
-| <https://mirror.maakpain.kro.kr/void/>             | Asia: Seoul, SK   |
 | <https://void.webconverger.org/>                   | Asia: Singapore   |
 | <https://mirror.aarnet.edu.au/pub/voidlinux/>      | AU: Canberra      |
 | <https://ftp.swin.edu.au/voidlinux/>               | AU: Melbourne     |