update README.md

Author: shunk031

README.md

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 # 🤗 Noise Conditional Score Networks
 
 [![CI](https://github.com/py-img-gen/diffusers-ncsn/actions/workflows/ci.yaml/badge.svg)](https://github.com/py-img-gen/diffusers-ncsn/actions/workflows/ci.yaml) 
-[![](https://img.shields.io/badge/Official_code-GitHub-green)](https://github.com/ermongroup/ncsn)
+[![Document](https://github.com/py-img-gen/diffusers-ncsn/actions/workflows/gh-pages.yaml/badge.svg)](https://github.com/py-img-gen/diffusers-ncsn/actions/workflows/gh-pages.yaml)
+[![ermongroup/ncsn](https://img.shields.io/badge/Official_code-GitHub-green)](https://github.com/ermongroup/ncsn)
 [![Model on HF](https://img.shields.io/badge/🤗%20Model%20on%20HF-py--img--gen/ncsn--mnist-D4AA00)](https://huggingface.co/py-img-gen/ncsn-mnist)
 
 [`🤗 diffusers`](https://github.com/huggingface/diffusers) implementation of the paper ["Generative Modeling by Estimating Gradients of the Data Distribution" [Yang+ NeurIPS'19]](https://arxiv.org/abs/1907.05600).