docs(App): add router-view transition

Author: johnleider

packages/docs/src/App.vue

@@ -1,5 +1,9 @@
 <template>
-  <router-view />
+  <router-view v-slot="{ Component }">
+    <v-fade-transition appear>
+      <component :is="Component" />
+    </v-fade-transition>
+  </router-view>
 </template>
 
 <script setup lang="ts">