📚 README.md: Add Discourse shield to header table (#6138)

README.md

@@ -8,7 +8,7 @@ AiiDA (www.aiida.net) is a workflow manager for computational science with a str
 |Getting help| [![Docs status](https://readthedocs.org/projects/aiida-core/badge)](http://aiida-core.readthedocs.io/) [![Discourse status](https://img.shields.io/discourse/status?server=https%3A%2F%2Faiida.discourse.group%2F)](https://aiida.discourse.group/)
 |Build status| [![Build Status](https://github.com/aiidateam/aiida-core/actions/workflows/ci-code.yml/badge.svg)](https://github.com/aiidateam/aiida-core/actions) [![Coverage Status](https://codecov.io/gh/aiidateam/aiida-core/branch/main/graph/badge.svg)](https://codecov.io/gh/aiidateam/aiida-core) [Benchmarks](https://aiidateam.github.io/aiida-core/dev/bench/ubuntu-22.04/psql_dos/) |
 |Activity| [![PyPI-downloads](https://img.shields.io/pypi/dm/aiida-core.svg?style=flat)](https://pypistats.org/packages/aiida-core) [![Commit Activity](https://img.shields.io/github/commit-activity/m/aiidateam/aiida-core.svg)](https://github.com/aiidateam/aiida-core/pulse)
-|Community|  [![Affiliated with NumFOCUS](https://img.shields.io/badge/NumFOCUS-affiliated%20project-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)](https://numfocus.org/sponsored-projects/affiliated-projects) [![Twitter](https://img.shields.io/twitter/follow/aiidateam.svg?style=social&label=Follow)](https://twitter.com/aiidateam)
+|Community|  [![Discourse](https://img.shields.io/discourse/topics?server=https%3A%2F%2Faiida.discourse.group%2F&logo=discourse)](https://aiida.discourse.group/) [![Affiliated with NumFOCUS](https://img.shields.io/badge/NumFOCUS-affiliated%20project-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)](https://numfocus.org/sponsored-projects/affiliated-projects) [![Twitter](https://img.shields.io/twitter/follow/aiidateam.svg?style=social&label=Follow)](https://twitter.com/aiidateam)
 
 
 ## Features