Update README.md (#477)

Update badges on the top-level README to point to conda instead of PyPI.

README.md

@@ -1,14 +1,22 @@
 <img src="./docs/assets/logo.png" width=800>
 
+![Install with conda](https://anaconda.org/xformers/xformers/badges/installer/conda.svg)
+![Downloads](https://anaconda.org/xformers/xformers/badges/downloads.svg)
+![License](https://anaconda.org/xformers/xformers/badges/license.svg)
+[![Open in Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/facebookresearch/xformers/blob/main/docs/source/xformers_mingpt.ipynb)
+<br/><!--
 ![PyPI](https://img.shields.io/pypi/v/xformers)
 ![PyPI - License](https://img.shields.io/pypi/l/xformers)
+-->
 [![Documentation Status](https://github.com/facebookresearch/xformers/actions/workflows/gh-pages.yml/badge.svg)](https://github.com/facebookresearch/xformers/actions/workflows/gh-pages.yml/badge.svg)
 [![CircleCI](https://circleci.com/gh/facebookresearch/xformers.svg?style=shield)](https://app.circleci.com/pipelines/github/facebookresearch/xformers/)
-[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](CONTRIBUTING.md)
-[![codecov](https://codecov.io/gh/facebookresearch/xformers/branch/main/graph/badge.svg?token=PKGKDR4JQM)](https://codecov.io/gh/facebookresearch/xformers)
+[![Codecov](https://codecov.io/gh/facebookresearch/xformers/branch/main/graph/badge.svg?token=PKGKDR4JQM)](https://codecov.io/gh/facebookresearch/xformers)
 [![black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
-[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/facebookresearch/xformers/blob/main/docs/source/xformers_mingpt.ipynb)
+<br/>
+[![PRs welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](CONTRIBUTING.md)
+<!--
 [![Downloads](https://pepy.tech/badge/xformers)](https://pepy.tech/project/xformers)
+-->
 --------------------------------------------------------------------------------
 
 ## Description