doc: update qrcode

Author: tangjinzhou

site/src/components/rice/right_bottom_rice.vue

@@ -1,6 +1,12 @@
 <template>
   <div id="right-bottom">
-    <img v-if="isCN" width="150" alt="官方公众号" src="https://qn.antdv.com/wechat.jpeg" />
+    <img
+      v-if="isCN && isEffective('2021-10-17 10:00:00', '2021-10-23 18:00:00')"
+      width="150"
+      alt="早早聊 Vue 专场大会"
+      :src="`https://next-antdv.oss-cn-beijing.aliyuncs.com/zaozaoliao.png?v=${Date.now()}`"
+    />
+    <img v-else-if="isCN" width="150" alt="官方公众号" src="https://qn.antdv.com/wechat.jpeg" />
     <div v-if="isMobile" class="close" @click="visible = false">
       <close-outlined />
     </div>