docs: remove codebeat badge from project documentation badges

- Remove the codebeat badge from the list of project badges

Signed-off-by: appleboy <[email protected]>

Author: appleboy

README.md

@@ -6,7 +6,6 @@ A push notification micro server using [Gin](https://github.com/gin-gonic/gin) f
 [![GoDoc](https://godoc.org/github.com/appleboy/gorush?status.svg)](https://pkg.go.dev/github.com/appleboy/gorush)
 [![codecov](https://codecov.io/gh/appleboy/gorush/branch/master/graph/badge.svg)](https://codecov.io/gh/appleboy/gorush)
 [![Go Report Card](https://goreportcard.com/badge/github.com/appleboy/gorush)](https://goreportcard.com/report/github.com/appleboy/gorush)
-[![codebeat badge](https://codebeat.co/badges/0a4eff2d-c9ac-46ed-8fd7-b59942983390)](https://codebeat.co/projects/github.zerozr99.workers.dev-appleboy-gorush)
 [![Docker Pulls](https://img.shields.io/docker/pulls/appleboy/gorush.svg)](https://hub.docker.com/r/appleboy/gorush/)
 [![Netlify Status](https://api.netlify.com/api/v1/badges/8ab14c9f-44fd-4d9a-8bba-f73f76d253b1/deploy-status)](https://app.netlify.com/sites/gorush/deploys)
 [![Financial Contributors on Open Collective](https://opencollective.com/gorush/all/badge.svg?label=financial+contributors)](https://opencollective.com/gorush)