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/loading.md

@@ -1,21 +1,19 @@
 <style>
-@component-namespace demo {
-  @b loading {
-    .van-loading {
-      margin: 0 auto;
-    }
+.demo-loading {
+  .van-loading {
+    margin: 0 auto;
+  }
 
-    .circle-loading {
-      margin: 20px auto;
-    }
+  .circle-loading {
+    margin: 20px auto;
+  }
 
-    .demo-loading__example--with-bg {
-      background-color: rgba(17, 17, 17, 0.7);
-      margin: 0 auto;
-      width: 120px;
-      padding: 45px 0;
-      border-radius: 10px;
-    }
+  .demo-loading__example--with-bg {
+    background-color: rgba(17, 17, 17, 0.7);
+    margin: 0 auto;
+    width: 120px;
+    padding: 45px 0;
+    border-radius: 10px;
   }
 }
 </style>