docs: use npm install in README

Author: afc163

README.md

@@ -57,7 +57,7 @@ export default () => <TreeSelect treeData={treeData} placeholder="Select a node"
 Run the local dumi site:
 
 ```bash
-ut install
+npm install
 npm start
 ```
 
@@ -163,7 +163,7 @@ therefore differ.
 ## Development
 
 ```bash
-ut install
+npm install
 npm start
 npm test
 npm run lint

README.zh-CN.md

@@ -57,7 +57,7 @@ export default () => <TreeSelect treeData={treeData} placeholder="Select a node"
 运行本地 dumi 站点：
 
 ```bash
-ut install
+npm install
 npm start
 ```
 
@@ -157,7 +157,7 @@ therefore differ.
 ## 本地开发
 
 ```bash
-ut install
+npm install
 npm start
 npm test
 npm run lint