docs(README.md): 美化关键图片

lecepin · LeoYuan · commit 2634161a25d6 · 2022-03-30T15:38:25.000+08:00
diff --git a/packages/engine/README.md b/packages/engine/README.md
@@ -29,7 +29,7 @@ An enterprise-class low-code technology stack for scale-out design
 
 </div>
 
-[![](https://img.alicdn.com/imgextra/i4/O1CN01GhzQuE1rnenyCCQTF_!!6000000005676-0-tps-2878-1588.jpg)](http://lowcode-engine.cn)
+[![](https://img.alicdn.com/imgextra/i2/O1CN01UhoS7C1sNNhySvfWi_!!6000000005754-2-tps-2878-1588.png)](http://lowcode-engine.cn)
 
 English | [简体中文](./packages/engine/README-zh_CN.md)
 
@@ -152,4 +152,4 @@ Please read first:
 2. [About the R&D collaboration process of the engine](https://www.yuque.com/lce/doc/contributing)
 3. [Engineering Configuration of Engine](https://www.yuque.com/lce/doc/gxwqg6)
 
-> Strongly recommend reading ["The Wisdom of Asking Questions"](https://github.com/ryanhanwu/How-To-Ask-Questions-The-Smart-Way), ["How to Ask Questions to the Open Source Community"](https: //github.com/seajs/seajs/issues/545) and [How to Report Bugs Effectively](http://www.chiark.greenend.org.uk/%7Esgtatham/bugs-cn.html), [ "How to Submit Unanswerable Questions to Open Source Projects"](https://zhuanlan.zhihu.com/p/25795393), better questions are easier to get help. (This paragraph refers to [antd](https://github.com/ant-design/ant-design))
+> Strongly recommend reading ["The Wisdom of Asking Questions"](https://github.com/ryanhanwu/How-To-Ask-Questions-The-Smart-Way), ["How to Ask Questions to the Open Source Community"](https: //github.com/seajs/seajs/issues/545) and [How to Report Bugs Effectively](http://www.chiark.greenend.org.uk/%7Esgtatham/bugs-cn.html), [ "How to Submit Unanswerable Questions to Open Source Projects"](https://zhuanlan.zhihu.com/p/25795393), better questions are easier to get help. (This paragraph refers to [antd](https://github.com/ant-design/ant-design))
