<!-- Vue -->
<script src="https://unpkg.com/vue"></script>
<script src="js/vue-script.js"></script> // custom Vue app code here

<!-- main stylesheet link -->
<link rel="stylesheet" href="css/style.css" />

// Vue app in index.html -------------------
<div id="app">
...all my elements...
</div>

// Vue app in js -------------------
window.onload = function () {
    Vue.use(VueSmoothScroll);
    var app = new Vue({
        el: '#app',
        data: {
            projects: [
                {...some array 1...},
                {...some array 2...}
            ]
        }
    })
}