This add missing links to resources already hosted on CDN for Bootstrap 4, but missing in docs.
The resources linked can be used standalone by developers without using main `bootstrap.css` resource:
- to just reset the default browsers styling and built upon this own solution
- to just use the grid layout from Bootstrap without a need to use the fully fledged components.
Reference:
http://getbootstrap.com/docs/4.1/getting-started/contents/
Thanks!
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