archwiki: Change zh-hans interlanguage link
The Chinese (Simplified) team request to move zh-hans to external wikis. See current discussion: https://wiki.archlinux.org/title/Help_talk:I18n#Moving_Simplified_Chinese_to_the_external_wiki
All xxxxxx_(简体中文) pages on archwiki are already copied to wiki.archlinuxcn.org. The zh-hans interlanguage link should be changed from https://wiki.archlinux.org/title/xxx to https://wiki.archlinuxcn.org/wiki/xxx.
All new zh-hans changes need to be sync between the two. So althrough the discussion is still on going, it is non-blocking so we can proceed with the change right now.