依赖更新 && 构建调整 (#60)

* upgrade dependencies

* 更改所有 saladcss 写法

* fix: 升级依赖导致的样式错误

* fix: build vant css

* use es module when pack && webpack scope hoisting

* fix: vue module version

* delete unused npm script

* fix: build:vant script not work

* fix: webpack config format

* fix: build minify vant.js

* fix: captain ui relative link

docs/examples-docs/icon.md

@@ -1,20 +1,18 @@
 <style>
-@component-namespace demo {
-  @b icon {
-    .examples {
-      max-height: none;
-    }
+.demo-icon {
+  .examples {
+    max-height: none;
+  }
 
-    .van-col {
-      text-align: center;
-      height: 120px;
-    }
+  .van-col {
+    text-align: center;
+    height: 120px;
+  }
 
-    .van-icon {
-      font-size: 45px;
-      display: block;
-      margin: 15px 0;
-    }
+  .van-icon {
+    font-size: 45px;
+    display: block;
+    margin: 15px 0;
   }
 } 
 </style>