docs: replacing GitLab CI with GitHub Actions badge (#17)

Author: DeveloperC286

README.md

@@ -1,6 +1,6 @@
 # Monkey Interpreter
 [![Latest Release](https://gitlab.com/DeveloperC/monkey_interpreter/-/badges/release.svg)](https://gitlab.com/DeveloperC/monkey_interpreter/-/releases)
-[![Pipeline Status](https://gitlab.com/DeveloperC/monkey_interpreter/badges/master/pipeline.svg)](https://gitlab.com/DeveloperC/monkey_interpreter/-/pipelines)
+[![Continuous Integration (CI)](https://github.com/DeveloperC286/monkey_interpreter/actions/workflows/continuous-integration.yml/badge.svg)](https://github.com/DeveloperC286/monkey_interpreter/actions/workflows/continuous-integration.yml)
 [![Conventional Commits](https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg)](https://conventionalcommits.org)
 [![License](https://img.shields.io/badge/License-AGPLv3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)