Update index.md

Author: bmucsanyi

docs/index.md

@@ -5,7 +5,7 @@
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 [![Python
 3.11+](https://img.shields.io/badge/python-3.11+-green.svg)](https://www.python.org/downloads/release/python-3110/)
-[![Test](https://github.com/laplax-org/laplax/actions/workflows/test.yaml/badge.svg)](https://github.com/laplax-org/laplax/actions/workflows/test.yaml) [![Coverage Status](https://coveralls.io/repos/github/laplax-org/laplax/badge.svg?branch=laplax_api)](https://coveralls.io/github/laplax-org/laplax?branch=laplax_api)
+[![Test](https://github.com/laplax-org/laplax/actions/workflows/test.yaml/badge.svg)](https://github.com/laplax-org/laplax/actions/workflows/test.yaml) [![Docs](https://github.com/laplax-org/laplax/actions/workflows/docs.yaml/badge.svg)](https://github.com/laplax-org/laplax/actions/workflows/docs.yaml) [![Coverage Status](https://coveralls.io/repos/github/laplax-org/laplax/badge.svg?branch=laplax_api)](https://coveralls.io/github/laplax-org/laplax?branch=laplax_api)
 
 > Laplace Approximations in JAX.