remove old badges

README.md

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 # ngshare_exchange
-[![Build Status](https://travis-ci.org/LibreTexts/ngshare_exchange.svg?branch=master)](https://travis-ci.org/LibreTexts/ngshare_exchange)
 [![codecov](https://codecov.io/gh/LibreTexts/ngshare_exchange/branch/master/graph/badge.svg)](https://codecov.io/gh/LibreTexts/ngshare_exchange)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
-[![Documentation Status](https://readthedocs.org/projects/ngshare-exchange/badge/?version=latest)](https://ngshare-exchange.readthedocs.io/en/latest/?badge=latest)
 
 Custom [nbgrader](https://github.com/jupyter/nbgrader) exchange to be used with [ngshare](https://github.com/LibreTexts/ngshare). This should be installed in the singleuser image of [Z2JH](https://github.com/jupyterhub/zero-to-jupyterhub-k8s) to allow the users to use ngshare.