fix(pages): remove broken config.ts causing VitePress build failure

- config.ts was trying to import './index.mts' which doesn't exist
- The actual VitePress config is in config.mts
- Remove config.ts to fix Documentation workflow build

Fixes: Could not resolve './index.mts' error

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

Author: shijiashuai