doc: Update README.md

- add CI status badge
- remove broken links

README.md

@@ -2,6 +2,7 @@
 
 # Sentinel: The Sentinel of Your Microservices
 
+[![Sentinel CI](https://github.com/alibaba/Sentinel/actions/workflows/ci.yml/badge.svg)](https://github.com/alibaba/Sentinel/actions/workflows/ci.yml)
 [![Codecov](https://codecov.io/gh/alibaba/Sentinel/branch/master/graph/badge.svg)](https://codecov.io/gh/alibaba/Sentinel)
 [![Maven Central](https://img.shields.io/maven-central/v/com.alibaba.csp/sentinel-core.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:com.alibaba.csp%20AND%20a:sentinel-core)
 [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)
@@ -175,6 +176,5 @@ If you are using Sentinel, please [add your company here](https://github.com/ali
 ![文轩在线](http://static.winxuancdn.com/css/v2/images/logo.png)
 ![客如云](https://www.keruyun.com/static/krynew/images/logo.png)
 ![亲宝宝](https://stlib.qbb6.com/wclt/img/home_hd/version1/title_logo.png)
-![杭州光云科技](https://www.raycloud.com/images/logo.png)
 ![金汇金融](https://res.jinhui365.com/r/images/logo2.png?v=1.527)
 ![闪电购](http://cdn.52shangou.com/shandianbang/official-source/3.1.1/build/images/logo.png)