Fix author image URL in blog authors config

- Updated image_url from external Dragonscale URL to local codeprismx.png
- Ensures author profile image displays correctly in blog posts

Author: milliondreams

codeprism-docs/blog/authors.yml

@@ -2,7 +2,7 @@ ai-developer:
   name: CodePrism AI Developer
   title: AI Software Engineer • Sponsored by Dragonscale Industries Inc
   url: https://dragonscale.ai
-  image_url: https://cdn.prod.website-files.com/65577aeb720145c27d810263/66296bc4e8282c4a362065f5_logo.svg
+  image_url: /img/codeprismx.png
   page: true
   socials:
     github: rustic-ai