chore: add docs/ to .gitignore (separate git repository)

- docs/ directory contains independent Astro site
- Managed separately for GitHub Pages deployment

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: LessUp

.gitignore

@@ -42,3 +42,6 @@ _site/
 # OS
 .DS_Store
 Thumbs.db
+
+# Separate git repository
+docs/