Clean up post-deployment: remove debug step and backup files

- Remove debug navbar output from GitHub Actions workflow
- Delete obsolete navbar_old.html backup file
- Navigation system is now fully functional with "Catalog" links

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

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

Author: tomvannuenen

.github/workflows/jekyll.yml

@@ -29,12 +29,6 @@ jobs:
           ruby-version: '3.1'
           bundler-cache: false
 
-      - name: Debug navbar file
-        run: |
-          echo "=== Current navbar content ==="
-          cat _includes/navbar.html | grep -A5 -B5 "Library\|Catalog"
-          echo "=== End navbar content ==="
-      
       - name: Install dependencies
         run: bundle install