Update mainpage.md

Author: ramsafin

docs/mainpage.md

@@ -3,7 +3,6 @@
 [![CI](https://github.com/ramsafin/modern-cpp-project-template/actions/workflows/ci.yml/badge.svg)](https://github.com/ramsafin/modern-cpp-project-template/actions/workflows/ci.yml)
 [![Clang-Format](https://github.com/ramsafin/modern-cpp-project-template/actions/workflows/clang-format.yml/badge.svg)](https://github.com/ramsafin/modern-cpp-project-template/actions/workflows/clang-format.yml)
 [![Clang-Tidy](https://github.com/ramsafin/modern-cpp-project-template/actions/workflows/clang-tidy.yml/badge.svg)](https://github.com/ramsafin/modern-cpp-project-template/actions/workflows/clang-tidy.yml)
-[![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](LICENSE)
 
 A modern C++20+ starter project using CMake, GoogleTest, sanitizers, GitHub Actions, and developer tooling.