fix: Documentation API authentication and build script

- Added X-WP-Nonce header to docs API fetch calls in Help page
- Fixed build-production.sh to include docs/ folder (changed --exclude='*.md' to --exclude='/*.md')
- This allows root-level docs like README.md to be excluded while keeping docs/ folder

build-production.sh

@@ -40,7 +40,7 @@ rsync -av --progress \
   --exclude='admin-spa' \
   --exclude='examples' \
   --exclude='*.sh' \
-  --exclude='*.md' \
+  --exclude='/*.md' \
   --exclude='archive' \
   --exclude='test-*.php' \
   --exclude='check-*.php' \