I've opened a fresh Bootstrap sub-theme. This sub-theme is empty of any styles. What is the right way to import the CDN-mediated style sheets into the (now-empty) Style.css of the sub-theme?
It's a long story why I don't want to use the Bootstrap CDN in that particular case but I really just want everything to be local.
How could I import the basic Bootstrap Stylesheets into my Sub-theme's Style.css file and finally use everything local?