chore: Remove CodeFactor badge, it's broken 80% of the time

Author: agateau-gg

README.md

@@ -6,7 +6,6 @@
 [![License](https://img.shields.io/github/license/GitGuardian/py-gitguardian?color=%231B2D55&style=for-the-badge)](LICENSE)
 [![GitHub stars](https://img.shields.io/github/stars/gitguardian/py-gitguardian?color=%231B2D55&style=for-the-badge)](https://github.com/GitGuardian/py-gitguardian/stargazers)
 ![GitHub Workflow Status](https://img.shields.io/github/workflow/status/GitGuardian/py-gitguardian/Main?style=for-the-badge)
-[![CodeFactor Grade](https://img.shields.io/codefactor/grade/github/gitguardian/py-gitguardian?style=for-the-badge)](https://www.codefactor.io/repository/github/gitguardian/py-gitguardian)
 [![Codecov](https://img.shields.io/codecov/c/github/GitGuardian/py-gitguardian?style=for-the-badge)](https://codecov.io/gh/GitGuardian/py-gitguardian/)
 
 API client library for the [GitGuardian API](https://api.gitguardian.com/).