docs: update readme

README.md

@@ -1,7 +1,7 @@
 # 使用 VuePress 构建个人博客
 
 - VuePress、Valine
-- 我的博客示例：[yangtao.site/vuepress/](http://www.yangtao.site/vuepress/)
+- 我的博客示例：[yangtao.site/vuepress/](https://www.yangtao.site/vuepress/)
 
 ## 文档
 
@@ -18,38 +18,8 @@ git clone https://github.com/yangtao2o/vuepress.git
 cd vuepress
 
 # 安装依赖
-➜  vuepress git:(master) ✗ npm i
+yarn
 
 # 启动一个本地服务
-➜  vuepress git:(master) ✗ npm run dev
-
-> [email protected] dev /Users/yangtao/Documents/yangtao/myblog/vuepress
-> vuepress dev docs
-
-DONE  [11:06:21] Build 63b84b finished in 3731 ms!
-
-> VuePress dev server listening at http://localhost:8080/vuepress/
-
-# 构建发布
-npm run deploy
-```
-
-## 报错
-
-### Question
-
-```js
-(node:84725) UnhandledPromiseRejectionWarning: TypeError: res.getHeader is not a function
+yarn dev
 ```
-
-查看： [Issues](https://github.com/vuejs/vuepress/issues/1417)
-
-解决：
-
-While the npm user can re-install webpack-dev-middleware with a specific version:
-
-```bash
-npm install [email protected]
-```
-
-When webpack-dev-middleware fixes the issue and publishes, the issue can be closed.