Following the Plone 5 Theming tutorial results in an unthemed Plone

I ran into an issue when running buildout, which I was able to resolve by specifying the version for flake8.

I got confused by this step, Download and prepare a static theme:

Let’s start with an untouched static theme, such as this bootstrap theme: Start Bootstrap. Just download it and extract it into the theme folder. Replace the index.html with the one in the downloaded theme:

When I extract it into the theme folder, my structure is different, where there is a folder within the theme folder, startbootstrap-business-casual-gh-pages. Am I supposed to move only a few files from startbootstrap-business-casual-gh-pages into theme?