All of the common files needed by extensions are here: All this gets copied to the static/<mybook>/_static folder when sphinx is run.
bootstrap: images/* -- these are all of the images used by the bootstrap theme The images subfolder is there because the bootsrap theme expects to find all of its images in _static/images
js -- javascript files for all of the runestone extensions are here, as well as jquery and other requirements
css -- all of the css files
images -- This is for misc images not associated with bootstrap that should end up in the _static folder
ext -- This contains the submodules that are used by the sphinx directives currently
- skulpt -- only skulpt/dist/*.js gets copied to the _static folder
- js-parsons -- everything under js-parsons ends up in _static
- codelens -- everything under codelens/v3 ends up in _static