[Doc] new theme

packages/icon/en-US.md

@@ -1,15 +1,16 @@
-## Icon
+# Icon
 
 ### Install
+
 ``` javascript
 import { Icon } from 'vant';
 
 Vue.use(Icon);
 ```
 
-### Usage
+## Usage
 
-#### Basic Usage
+### Basic Usage
 
 Use `name` prop to set icon name or icon URL
 
@@ -18,21 +19,22 @@ Use `name` prop to set icon name or icon URL
 <van-icon name="https://b.yzcdn.cn/vant/icon-demo-1126.png" />
 ```
 
-#### Show Info
+### Show Info
 
 ```html
 <van-icon name="chat" info="9" />
 <van-icon name="chat" info="99+" />
 ```
 
-#### Use local font file
+### Use local font file
+
 Icon uses font file in `yzcdn.cn` by default，if you want to use the local font file，please import the following css file.
 
 ```js
 import 'vant/lib/icon/local.css';
 ```
 
-#### Add custom iconfont
+### Add custom iconfont
 
 ```css
 @font-face {
@@ -53,6 +55,8 @@ import 'vant/lib/icon/local.css';
 <van-icon class-prefix="my-icon" name="extra" />
 ```
 
+## API
+
 ### Props
 
 | Attribute | Description | Type | Default |