fix: exclude DEPLOYMENT.md and SETUP_SUMMARY.md from Jekyll build

These are internal documentation files that contain Liquid-like syntax for examples, not actual Jekyll templates.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: jeremyeder

docs/_config.yml

@@ -74,6 +74,8 @@ exclude:
   - .sass-cache
   - .jekyll-cache
   - README.md
+  - DEPLOYMENT.md
+  - SETUP_SUMMARY.md
 
 # Site metadata
 version: 1.0.0