How do I import Bootstrap in SvelteKit, Recommended Way?

I am building a site with SvelteKit. As of now I included Bootstrap 5 in my project by adding it to the app.html file provided by the SvelteKit Skeleton project:

<!-- Bootstrap styles and javascript --> <link rel="stylesheet" href="/node_modules/bootstrap/dist/css/bootstrap.min.css"><script src="/node_modules/bootstrap/dist/js/bootstrap.bundle.min.js"></script>

Now when building the site with npm run build the bootstrap modules are not loaded anymore.