Although version 5 of Bootstrap is still only Alpha, you can already get this set of starter templates compatible with the new version.
This collection will be updated as we update and release new versions of Bootstrap 5.
While the dependencies are linking to the official CDN, however, I'm already working on a version of the theme of the styles with a GulpJS file.
Download free example template:
See more here: https://www.bootstrap-starter-kit.com