docs: Update GitHub Actions workflow status badge URLs

* The previous URLs are starting to break and so the current web API
  URLs for the status badges is used.

README.rst

@@ -398,11 +398,11 @@ and grant `OAC-1450377 <https://www.nsf.gov/awardsearch/showAward?AWD_ID=1450377
 .. |Code style: black| image:: https://img.shields.io/badge/code%20style-black-000000.svg
    :target: https://github.com/psf/black
 
-.. |GitHub Actions Status: CI| image:: https://github.com/scikit-hep/pyhf/workflows/CI/CD/badge.svg?branch=main
-   :target: https://github.com/scikit-hep/pyhf/actions?query=workflow%3ACI%2FCD+branch%3Amain
-.. |GitHub Actions Status: Docs| image:: https://github.com/scikit-hep/pyhf/workflows/Docs/badge.svg?branch=main
-   :target: https://github.com/scikit-hep/pyhf/actions?query=workflow%3ADocs+branch%3Amain
-.. |GitHub Actions Status: Publish| image:: https://github.com/scikit-hep/pyhf/workflows/publish%20distributions/badge.svg?branch=main
-   :target: https://github.com/scikit-hep/pyhf/actions?query=workflow%3A%22publish+distributions%22+branch%3Amain
-.. |GitHub Actions Status: Docker| image:: https://github.com/scikit-hep/pyhf/actions/workflows/docker.yml/badge.svg?branch=main
-   :target: https://github.com/scikit-hep/pyhf/actions/workflows/docker.yml?query=branch%3Amain
+.. |GitHub Actions Status: CI| image:: https://github.com/scikit-hep/pyhf/actions/workflows/ci.yml/badge.svg
+   :target: https://github.com/scikit-hep/pyhf/actions/workflows/ci.yml
+.. |GitHub Actions Status: Docs| image:: https://github.com/scikit-hep/pyhf/actions/workflows/docs.yml/badge.svg
+   :target: https://github.com/scikit-hep/pyhf/actions/workflows/docs.yml
+.. |GitHub Actions Status: Publish| image:: https://github.com/scikit-hep/pyhf/actions/workflows/publish-package.yml/badge.svg
+   :target: https://github.com/scikit-hep/pyhf/actions/workflows/publish-package.yml
+.. |GitHub Actions Status: Docker| image:: https://github.com/scikit-hep/pyhf/actions/workflows/docker.yml/badge.svg
+   :target: https://github.com/scikit-hep/pyhf/actions/workflows/docker.yml