docs: remove circleci badge, add others

README.md

@@ -1,10 +1,12 @@
 # The Littlest JupyterHub
 
-[![](https://circleci.com/gh/jupyterhub/the-littlest-jupyterhub.svg?style=shield)](https://circleci.com/gh/jupyterhub/the-littlest-jupyterhub)
-[![](https://codecov.io/gh/jupyterhub/the-littlest-jupyterhub/branch/master/graph/badge.svg)](https://codecov.io/gh/jupyterhub/the-littlest-jupyterhub)
-[![](https://readthedocs.org/projects/the-littlest-jupyterhub/badge/?version=latest)](https://the-littlest-jupyterhub.readthedocs.io)
-[![](https://badges.gitter.im/jupyterhub/jupyterhub.svg)](https://gitter.im/jupyterhub/jupyterhub)
-[![](https://img.shields.io/badge/I_want_to_contribute!-grey?logo=jupyter)](https://the-littlest-jupyterhub.readthedocs.io/en/latest/contributing/index.html)
+[![Documentation build status](https://img.shields.io/readthedocs/the-littlest-jupyterhub?logo=read-the-docs)](https://tljh.jupyter.org/en/latest/?badge=latest)
+[![GitHub Workflow Status - Test](https://img.shields.io/github/workflow/status/jupyterhub/the-littlest-jupyterhub/Unit%20tests?logo=github&label=tests)](https://github.com/jupyterhub/the-littlest-jupyterhub/actions)
+[![Test coverage of code](https://codecov.io/gh/jupyterhub/the-littlest-jupyterhub/branch/master/graph/badge.svg)](https://codecov.io/gh/jupyterhub/the-littlest-jupyterhub)
+[![GitHub](https://img.shields.io/badge/issue_tracking-github-blue?logo=github)](https://github.com/jupyterhub/the-littlest-jupyterhub/issues)
+[![Discourse](https://img.shields.io/badge/help_forum-discourse-blue?logo=discourse)](https://discourse.jupyter.org/c/jupyterhub/tljh)
+[![Gitter](https://img.shields.io/badge/social_chat-gitter-blue?logo=gitter)](https://gitter.im/jupyterhub/jupyterhub)
+[![Contribute](https://img.shields.io/badge/I_want_to_contribute!-grey?logo=jupyter)](https://tljh.jupyter.org/en/latest/contributing/index.html)
 
 **The Littlest JupyterHub** (TLJH) distribution helps you provide Jupyter Notebooks
 to 1-100 users on a single server.