Update README.md

Author: Chat2DB-Pro

README.md

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 # Chat2DB
 
-**English** | [中文](README_CN.md)· [Changelog](CHANGELOG.md) · [Doc](https://docs./) · [Report Bug](https://github.com/chat2db/Chat2DB/issues) · [PR](https://github.com/chat2db/Chat2DB/pulls)
+**English** | [中文](README_CN.md)· [Changelog](CHANGELOG.md) · [Doc](https://github.com/chat2db/Chat2db-website-old/blob/main/docs/index.md) · [Report Bug](https://github.com/chat2db/Chat2DB/issues) · [PR](https://github.com/chat2db/Chat2DB/pulls)
 
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