prepare use of vue for game/replay

public/App.vue.js

@@ -0,0 +1,18 @@
+export default {
+  name: 'app',
+  template: `
+  <div id="app">
+    <ul class="nav" v-if="showNav">
+      <li><router-link class="btn" :to="{name: 'index'}">Index</router-link></li>
+      <li><router-link class="btn" :to="{name: 'new-game'}">New game</router-link></li>
+    </ul>
+
+    <router-view />
+  </div>`,
+  computed: {
+    showNav () {
+      // TODO: add info wether to show nav to route props
+      return !['game', 'replay'].includes(this.$route.name)
+    },
+  },
+}