Update deploy.yml

Author: ChristianHohlfeld

.github/workflows/deploy.yml

@@ -16,9 +16,11 @@ jobs:
         run: chmod +x ./tests/run_tests.sh  # Ensure the script has execute permissions
         continue-on-error: false  # Skip deployment if tests fail
 
-      # Remove Jekyll build as it's not needed
+      # Prepare files for GitHub Pages and exclude the _site directory
       - name: Prepare files for GitHub Pages
-        run: mkdir -p ./_site && cp -r * ./_site  # Move all files to the _site directory
+        run: |
+          mkdir -p ./_site
+          rsync -av --progress ./ ./_site --exclude _site  # Use rsync to exclude the _site directory
 
       - name: Upload GitHub Pages artifact
         uses: actions/upload-pages-artifact@v3