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README.md

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 | **License** | **Documentation** | **Build Status** | **Coverage** | **DOI** |
 |:-----------------:|:-----------------:|:----------------:|:----------------:|:----------------:|
-| [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://github.com/MadNLP/MadNLP.jl/blob/master/LICENSE) | [![doc](https://img.shields.io/badge/docs-dev-blue.svg)](https://madnlp.github.io/MadNLP.jl/stable) [![doc](https://img.shields.io/badge/docs-dev-blue.svg)](https://madnlp.github.io/MadNLP.jl/dev) | [![build](https://github.com/MadNLP/MadNLP.jl/actions/workflows/test.yml/badge.svg)](https://github.com/MadNLP/MadNLP.jl/actions/workflows/test.yml) | [![codecov](https://codecov.io/gh/MadNLP/MadNLP.jl/branch/master/graph/badge.svg?token=MBxH2AAu8Z)](https://codecov.io/gh/MadNLP/MadNLP.jl) | [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5825776.svg)](https://doi.org/10.5281/zenodo.5825776) |
+| [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://github.com/MadNLP/MadNLP.jl/blob/master/LICENSE) | [![doc](https://img.shields.io/badge/docs-stable-blue.svg)](https://madnlp.github.io/MadNLP.jl/stable) [![doc](https://img.shields.io/badge/docs-dev-blue.svg)](https://madnlp.github.io/MadNLP.jl/dev) | [![build](https://github.com/MadNLP/MadNLP.jl/actions/workflows/test.yml/badge.svg)](https://github.com/MadNLP/MadNLP.jl/actions/workflows/test.yml) | [![codecov](https://codecov.io/gh/MadNLP/MadNLP.jl/branch/master/graph/badge.svg?token=MBxH2AAu8Z)](https://codecov.io/gh/MadNLP/MadNLP.jl) | [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5825776.svg)](https://doi.org/10.5281/zenodo.5825776) |
 
 ## Installation