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/button.md

@@ -1,20 +1,18 @@
 <style>
-@component-namespace demo {
-  @b button {
-    .van-button {
-      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
-      user-select: none;
-    }
-    .van-row {
-      padding: 0 15px;
-      margin-bottom: 20px;
-    }
-    .van-col-24 {
-      margin-bottom: 20px;
+.demo-button {
+  .van-button {
+    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+    user-select: none;
+  }
+  .van-row {
+    padding: 0 15px;
+    margin-bottom: 20px;
+  }
+  .van-col-24 {
+    margin-bottom: 20px;
 
-      &:last-child {
-        margin-bottom: 0;
-      }
+    &:last-child {
+      margin-bottom: 0;
     }
   }
 }