[Doc] update links

docs/markdown/changelog.generated.md

@@ -17,7 +17,7 @@
 **Issue**
 
 - PC端打开页面时，无法滑动日期控件 [\#1145](https://github.com/youzan/vant/issues/1145)
-- https://www.youzanyun.com/zanui/vant/examples\#/zh-CN/ [\#1143](https://github.com/youzan/vant/issues/1143)
+- https://youzan.github.io/vant/examples\#/zh-CN/ [\#1143](https://github.com/youzan/vant/issues/1143)
 - hello vant，这不是一个issues 这是一个吐槽- [\#1139](https://github.com/youzan/vant/issues/1139)
 - 有没有供设计参考的psd文件和规范呢 [\#1137](https://github.com/youzan/vant/issues/1137)
 - 请问 源码中  :class="b\(\)"  这个b 是怎么导入的? [\#1134](https://github.com/youzan/vant/issues/1134)

docs/markdown/intro.en-US.md

@@ -16,7 +16,7 @@
 
 ### Quickstart
 
-See in [Quickstart](https://www.youzanyun.com/zanui/vant#/en-US/quickstart).
+See in [Quickstart](#/en-US/quickstart).
 
 ### Contribution
 
@@ -29,7 +29,7 @@ Modern browsers and Android 4.0+, iOS 6+.
 ### Links
 
 * [Feedback](https://github.com/youzan/vant/issues)
-* [Changelog](https://www.youzanyun.com/zanui/vant#/en-US/changelog)
+* [Changelog](#/en-US/changelog)
 * [Weapp UI](https://github.com/youzan/zanui-weapp)
 * [React UI](https://www.youzanyun.com/zanui/zent)
 * [Vant Demo](https://github.com/youzan/vant-demo)

docs/markdown/intro.zh-CN.md

@@ -16,7 +16,7 @@
 
 ### 快速上手
 
-请参考 [快速上手](https://www.youzanyun.com/zanui/vant#/zh-CN/quickstart).
+请参考 [快速上手](#/zh-CN/quickstart).
 
 ### 贡献代码
 
@@ -32,7 +32,7 @@
 
 * [意见反馈](https://github.com/youzan/vant/issues)
 * [加入我们](https://job.youzan.com)
-* [更新日志](https://www.youzanyun.com/zanui/vant#/zh-CN/changelog)
+* [更新日志](#/zh-CN/changelog)
 * [React 组件库](https://www.youzanyun.com/zanui/zent)
 * [微信小程序组件库](https://github.com/youzan/zanui-weapp)
 * [vant-demo](https://github.com/youzan/vant-demo)