render demo client-only

docs/src/components/Demo/index.vue

@@ -1,4 +1,5 @@
 <template>
+  <client-only>
     <demo-frame v-if="inline && mainFile" v-bind="props" />
     <div class="demo" v-else>
       <template v-if="mainFile">
@@ -33,6 +34,7 @@
         Could not find a demo called “{{ name }}”.
       </div>
     </div>
+  </client-only>
 </template>
 
 <script>