docs(README): update badges for actions.

Author: pabroux

README.md

@@ -2,8 +2,7 @@
 
 <p align="left">
   <a href="https://github.com/pabroux/shell-utilities/blob/master/LICENSE"><img src="https://img.shields.io/github/license/pabroux/shell-utilities.svg?label=License" alt="License Badge"></a>
-  <a href="https://github.com/pabroux/shell-utilities/actions/workflows/code-quality-checker.yml"><img src="https://github.com/pabroux/shell-utilities/actions/workflows/code-quality-checker.yml/badge.svg" alt="Code Quality Checker Badge"></a>
-  <a href="https://github.com/pabroux/shell-utilities/actions/workflows/code-security-checker.yml"><img src="https://github.com/pabroux/shell-utilities/actions/workflows/code-security-checker.yml/badge.svg" alt="Code Security Checker Badge"></a>
+  <a href="https://github.com/pabroux/shell-utilities/actions/workflows/ci.yml"><img src="https://github.com/pabroux/shell-utilities/actions/workflows/ci.yml/badge.svg" alt="CI Badge"></a>
 </p>
 
 Collection of utility shell scripts.