Remove code quality image in README.adoc (#2539)

README.adoc

@@ -7,7 +7,6 @@ Edit the files in the src/main/asciidoc/ directory instead.
 
 image::https://circleci.com/gh/spring-cloud/spring-cloud-gateway/tree/master.svg?style=svg["CircleCI", link="https://circleci.com/gh/spring-cloud/spring-cloud-gateway/tree/master"]
 image::https://codecov.io/gh/spring-cloud/spring-cloud-gateway/branch/master/graph/badge.svg["Codecov", link="https://codecov.io/gh/spring-cloud/spring-cloud-gateway/branch/master"]
-image::https://api.codacy.com/project/badge/Grade/a6885a06921e4f72a0df0b7aabd6d118["Codacy code quality", link="https://www.codacy.com/app/spring-cloud/spring-cloud-gateway?utm_source=github.com&utm_medium=referral&utm_content=spring-cloud/spring-cloud-gateway&utm_campaign=Badge_Grade"]
 
 
 This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. Spring Cloud Gateway aims to provide a simple, yet effective way to route to APIs and provide cross cutting concerns to them such as: security, monitoring/metrics, and resiliency.