docs: fix broken workflow badge in README (#1370)

* Update note to support GitHub rendering

Signed-off-by: Srihari Thyagarajan <[email protected]>

* `chore`: update readme badge to reflect correct docs workflow

---------

Signed-off-by: Srihari Thyagarajan <[email protected]>

Author: Haleshot

docs/README.md

@@ -8,7 +8,7 @@
 
 [![GitHub](https://img.shields.io/github/stars/cocoindex-io/cocoindex?color=5B5BD6)](https://github.com/cocoindex-io/cocoindex)
 [![License](https://img.shields.io/badge/license-Apache%202.0-5B5BD6?logo=opensourceinitiative&logoColor=white)](https://opensource.org/licenses/Apache-2.0)
-[![docs](https://github.com/cocoindex-io/cocoindex/actions/workflows/docs.yml/badge.svg?event=push&color=5B5BD6)](https://github.com/cocoindex-io/cocoindex/actions/workflows/docs.yml)
+[![docs](https://github.com/cocoindex-io/cocoindex/actions/workflows/docs_test.yml/badge.svg)](https://github.com/cocoindex-io/cocoindex/actions/workflows/docs_test.yml)
 
 </div>