You just have to include your bundled .js file in your HTML file and include mounter div - so Vue could know where to execute the app.
Your index file could looks something like this (showing only body section)
...
<body>
<div id="app"></div>
<script src="bundle.js">
</body>
...
Your main Vue file could looks like this:
import Vue from 'vue'
import Hello from 'hello.vue'
const app = new Vue({
render: (h) => h(Hello)
}).$mount('#app')
And in this way you can store all other components into the hello.vue.
This is probably way that you should use when you are building SPA.