update(docs): fix view height

docs/app.vue

@@ -1,6 +1,6 @@
 <template>
   <Header />
-  <div class="flex h-full">
+  <div id="app" class="flex">
     <Sidebar />
     <div id="vue-flow-docs" class="flex-1">
       <NuxtPage />
@@ -10,4 +10,8 @@
 <style>
 @import 'assets/index.css';
 @import 'node_modules/@braks/vue-flow/dist/style.css';
+
+#app {
+  height: calc(100% - 92px);
+}
 </style>