web: Add vue router.

web/src/views/About.vue

@@ -0,0 +1,5 @@
+<template>
+  <div class="about">
+    <h1>This is an about page</h1>
+  </div>
+</template>

web/src/views/Home.vue

@@ -0,0 +1,18 @@
+<template>
+  <div class="home">
+    <img alt="Vue logo" src="../assets/logo.png" />
+    <HelloWorld msg="Welcome to Your Vue.js App" />
+  </div>
+</template>
+
+<script>
+// @ is an alias to /src
+import HelloWorld from '@/components/HelloWorld.vue';
+
+export default {
+  name: 'Home',
+  components: {
+    HelloWorld,
+  },
+};
+</script>