Would be correct to use F7 in the most basic form with just those 2 files:
framework7.bundle.min.js
framework7.bundle.min.css
and adding in index.html just this:
<head>
...
<link rel="stylesheet" href="framework7/css/framework7.bundle.min.css">
...
</head>
...
<script src="framework7/js/framework7.bundle.min.js"></script>
<!-- Cordova APIs -->
<script src="js/cordova-app.js"></script>
<!-- App routes -->
<script src="js/routes.js"></script>
<!-- App scripts -->
<script src="js/app.js"></script>
</body>
</html>
?