Remove link to translation associated with supply chain attack

This commit removes a link from our documentation to a Mandarin Chinese (Simplified) translation of our documentation which is hosted on a sub-domain of the `bootcss.com` domain previously involved in the `polyfill.io` supply chain attack.

Author: bardiharborow

site/data/translations.yml

@@ -3,11 +3,6 @@
   description: Bootstrap 5 繁體中文手冊
   url: https://bootstrap5.hexschool.com/
 
-- name: Simplified Chinese
-  code: zh-CN
-  description: Bootstrap 5 中文文档
-  url: https://v5.bootcss.com/
-
 - name: Japanese
   code: ja
   description: Bootstrap 5 日本語リファレンス