Merge pull request #443 from blink1073/cleanup-readme

Update CI badge and fix broken link

Author: blink1073

CONTRIBUTING.rst

@@ -11,7 +11,7 @@ share what area of the project you are interested in working on.
 For general documentation about contributing to Jupyter projects, see the
 `Project Jupyter Contributor Documentation`__.
 
-__ https://jupyter.readthedocs.io/en/latest/contributor/content-contributor.html
+__ https://jupyter.readthedocs.io/en/latest/contributing/content-contributor.html
 
 Setting Up a Development Environment
 ====================================

README.md

@@ -1,6 +1,6 @@
 # Jupyter Server
 
-[![Build Status](https://github.com/jupyter/jupyter_server/workflows/CI/badge.svg)](https://github.com/jupyter/jupyter_server/actions)
+[![Build Status](https://github.com/jupyter/jupyter_server/workflows/CI/badge.svg?branch=master)](https://github.com/jupyter/jupyter_server/actions)
 [![Documentation Status](https://readthedocs.org/projects/jupyter-server/badge/?version=latest)](http://jupyter-server.readthedocs.io/en/latest/?badge=latest)
 
 The Jupyter Server provides the backend (i.e. the core services, APIs, and REST endpoints) for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila.