docs: readme logo

README.md

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 一套京东风格的轻量级移动端 Vue3组件库
     
-![NutUI](https://img14.360buyimg.com/imagetools/jfs/t1/167902/2/8762/791358/603742d7E9b4275e3/e09d8f9a8bf4c0ef.png)
+![NutUI](https://img14.360buyimg.com/imagetools/s200x200_jfs/t1/167902/2/8762/791358/603742d7E9b4275e3/e09d8f9a8bf4c0ef.png)
 
 ## ⌨️ 本地开发