docs: add DeepWiki badge to README.md, enable auto refresh. (#744)

Signed-off-by: samzong <[email protected]>

Author: samzong

README.md

@@ -7,6 +7,7 @@
 [![License](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE)
 [![Crates.io](https://img.shields.io/crates/v/candle-semantic-router.svg)](https://crates.io/crates/candle-semantic-router)
 ![Test And Build](https://github.com/vllm-project/semantic-router/workflows/Test%20And%20Build/badge.svg)
+[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/vllm-project/semantic-router)
 
 **📚 [Complete Documentation](https://vllm-semantic-router.com) | 🚀 [Quick Start](https://vllm-semantic-router.com/docs/installation) | 📣 [Blog](https://vllm-semantic-router.com/blog/) | 📖 [Publications](https://vllm-semantic-router.com/publications/)**