If I add a line below the first in _output.yml:
bookdown::gitbook:
split_by: none
css: ...
in the bookdown-demo the output becomes a single .html file which looks kind of plain ugly. Is it somehow possible to retain the nice style which is produced by the default settings but in a single file? If I want to send the book to someone else sending a stack of files is not great, especially if the person who receives it is not familiar with HTML as a document format.