Is it confusing that the docs/ folder contains objects before you even run anything? They're there so that they can be served by github.io. Maybe they can stay there but the RMarkdown output can be generated into another folder.
Other files and folders like .binder and DESCRIPTION could be confusing. perhaps more emphasis on the doc tree in the readme. The additional files could be explained as well though.
The title in create_plot() is the result of a keyboard smash. This is a feature if people make the plan and then realise the plot title is wrong and then re-make it. Except I never mention this anywhere. Could update readme (see #1) and blog post.