remove unused code scanning action

Author: spirosmaggioros

README.md

@@ -7,7 +7,6 @@ AlgoPlus is a C++ library that includes ready-to-use complex **data structures**
 [![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/CSRT-NTUA/AlgoPlus)
 ![macos-tests](https://github.com/CSRT-NTUA/AlgoPlus/actions/workflows/macos_test_cases.yml/badge.svg)
 ![ubuntu-tests](https://github.com/CSRT-NTUA/AlgoPlus/actions/workflows/ubuntu_test_cases.yml/badge.svg)
-[![CodeQL CI](https://github.com/TheAlgorithms/C-Plus-Plus/actions/workflows/codeql.yml/badge.svg)](https://github.com/CSRT-NTUA/AlgoPlus/actions/workflows/codeql.yml)
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