Fix docs CI: remove npm cache from Node.js setup to avoid package.json requirement

Author: hudsonaikins

.github/workflows/docs-enhanced.yml

@@ -131,7 +131,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.NODE_VERSION }}
-          cache: 'npm'
 
       - name: Cache Python dependencies
         id: cache