FIX(docs): fix build output copy command

- Change cp -r build/* /build/ to cp -r build/. /build/
- This ensures all files and directories (including hidden files) are copied
- Fixes 403 Forbidden error caused by missing index.html in nginx root

docusaurus/deployment.yaml

@@ -37,7 +37,7 @@ spec:
           echo "Building Docusaurus site..."
           npm run build
           echo "Copying build output..."
-          cp -r build/* /build/
+          cp -r build/. /build/
           echo "Build complete!"
         volumeMounts:
         - name: build-output