[Doc] add goods demo (#242)

* [bugfix] Checkbox border render error in weixin browser

* [bugfix] TreeSelect dependency path error

* [bugfix] Swipe should clear autoplay timer when destroyed

* [bugfix] Optimize component dependency analyze when build style entry

* merge

* update yarn.lock

* update README.md

* update README.md

* update README.md

* update README.md

* update README.md

* [Doc] add more badges in README.md

* update README.md

* [bugfix] Address & Contact list style

* fix: contact test cases

* [bugfix] popup style missing when build style entry

* [bugfix] Search: onSearch event arguments missing

* [Doc] add demo pages

* update zan-doc@0.3.7

* fix: build entry error

* [Doc] add goods demo

* [bugfix] button primary background color

packages/cell/index.vue

@@ -2,7 +2,7 @@
   <a :class="['van-cell', 'van-hairline', { 'van-cell--required': required }]" :href="url" @click="$emit('click')">
     <div class="van-cell__title" v-if="$slots.title || title">
       <slot name="icon">
-        <i v-if="icon" class="van-icon" :class="'van-icon-' + icon" />
+        <van-icon v-if="icon" :name="icon" />
       </slot>
       <slot name="title">
         <span class="van-cell__text" v-text="title" />

packages/vant-css/src/common/var.css

@@ -2,15 +2,13 @@
 $black: #000;
 $white: #fff;
 $red: #f44;
+$blue: #38f;
+$orange: #f60;
 $green: #06bf04;
-$green-wx: #4b0;
 $gray: #c9c9c9;
 $gray-light: #e5e5e5;
 $gray-darker: #666;
 $gray-dark: #999;
-$yellow: #f09000;
-$orange: #f60;
-$blue: #38f;
 
 /* default colors */
 $text-color: #333;
@@ -20,7 +18,7 @@ $background-color: #f8f8f8;
 
 /* button */
 $button-primary-color: $white;
-$button-primary-background-color: $green-wx;
+$button-primary-background-color: #4b0;
 $button-primary-border-color: #0a0;
 $button-default-color: $text-color;
 $button-default-background-color: $white;