fix(doc): Remove broken CI link after CI refactoring in several build workflow

Author: mathieucarbou

README.md

@@ -8,7 +8,6 @@
 [![License: LGPL 3.0](https://img.shields.io/badge/License-LGPL%203.0-yellow.svg)](https://opensource.org/license/lgpl-3-0/)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](code_of_conduct.md)
 
-[![Build](https://github.com/ESP32Async/ESPAsyncWebServer/actions/workflows/ci.yml/badge.svg)](https://github.com/ESP32Async/ESPAsyncWebServer/actions/workflows/ci.yml)
 [![GitHub latest commit](https://badgen.net/github/last-commit/ESP32Async/ESPAsyncWebServer)](https://GitHub.com/ESP32Async/ESPAsyncWebServer/commit/)
 [![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/ESP32Async/ESPAsyncWebServer)