Remove stray SCADA blog post accidentally added to vda-6-3

nuxt/content/blog/2026/08/what-is-scada.md got swept into the VDA 6.3
commit by mistake; that content belongs to the scada-blog branch, not
this one.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: sumitshinde-84