README: Fix CI Badges (#270)

Author: ax3l

README.md

@@ -4,9 +4,9 @@
 ![Python3 API: Beta][dev-beta]
 [![Documentation Status](https://readthedocs.org/projects/pyamrex/badge/?version=latest)](https://pyamrex.readthedocs.io)
 [![Discussions](https://img.shields.io/badge/chat-discussions-turquoise.svg)](https://github.com/AMReX-Codes/pyamrex/discussions)  
-![linux](https://github.com/AMReX-Codes/pyamrex/workflows/linux/badge.svg?branch=development)
-![macos](https://github.com/AMReX-Codes/pyamrex/workflows/macos/badge.svg?branch=development)
-![windows](https://github.com/AMReX-Codes/pyamrex/workflows/windows/badge.svg?branch=development)  
+![Linux](https://github.com/AMReX-Codes/pyamrex/actions/workflows/ubuntu.yml/badge.svg?branch=development)
+![macOS](https://github.com/AMReX-Codes/pyamrex/actions/workflows/macos.yml/badge.svg?branch=development)
+![Windows](https://github.com/AMReX-Codes/pyamrex/actions/workflows/windows.yml/badge.svg?branch=development)
 [![License pyAMReX](https://img.shields.io/badge/license-BSD--3--Clause--LBNL-blue.svg)](https://spdx.org/licenses/BSD-3-Clause-LBNL.html)
 [![DOI (source)](https://img.shields.io/badge/DOI%20(source)-10.5281/zenodo.8408733-blue.svg)](https://doi.org/10.5281/zenodo.8408733)