Remove a deprecated badge

https://pulp.plan.io/issues/9590

[noissue]

Author: lubosmj

README.md

@@ -1,7 +1,5 @@
 # pulp_python
 
-![Pulp CI](https://github.com/pulp/pulp_python/actions/workflows/ci.yml/badge.svg?branch=master)
-
 ![Pulp Nightly CI/CD](https://github.com/pulp/pulp_python/actions/workflows/nightly.yml/badge.svg)
 
 A Pulp plugin to support hosting your own pip compatible Python packages.