To use the templates in MailChimp, all you have to do is create a ZIP with the distribution files and upload it as a new template in the MailChimp interface. The distribution files are generated in:
You can upload directly the output of the dist/ to any other provider. Make sure to replace the URL's for all images and the main CSS import with direct links.
<link href="./assets/css/styles.css" async defer="defer" rel="stylesheet">
<link href="https://yourdomain.com/assets/css/styles.css" async defer="defer" rel="stylesheet">