So I followed the guide on the Jekyll website by installing and running Jekyll (sure I don't have to post this here). And the site is up and running perfectly but for some reason I don't see the
This is the base Jekyll theme.
You must be running the recent Jekyll version 3.2, which introduces Gem based themes (from https://jekyllrb.com/docs/themes/):
Jekyll themes package layouts, includes, and stylesheets in a way that can be overridden by your site’s content.
The theme is set in _config.yml:
Initial files that were previously in
_sass are now packaged with the theme.