refactor(theme-default): tweak template and remove empty class (#148)

Author: Mister-Hope

packages/@vuepress/theme-default/src/client/components/Sidebar.vue

@@ -5,9 +5,11 @@
     <slot name="top" />
 
     <ul class="sidebar-links">
-      <template v-for="item in sidebarItems" :key="item.link || item.text">
-        <SidebarChild :item="item" />
-      </template>
+      <SidebarChild
+        v-for="item in sidebarItems"
+        :key="item.link || item.text"
+        :item="item"
+      />
     </ul>
 
     <slot name="bottom" />

packages/@vuepress/theme-default/src/client/components/ToggleSidebarButton.vue

@@ -10,7 +10,6 @@
       <path
         fill="currentColor"
         d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"
-        class=""
       />
     </svg>
   </div>