* Added documentation for including custom CSS on a site or page
* Removed non-configuration related content from 05-configuration.md and cleaned up some style in new sections of 16-stylesheets.md
* Moved small custom head documentation to a ProTip in _docs/06-overriding-theme-defaults.md
* Cleaned up some documentation, and added some example uses of custom head and footer.
* Replace double space with single
* Replace double spaces with single
Co-authored-by: Tom Manner <tsmanner@us.ibm.com>
Co-authored-by: Michael Rose <mmistakes@users.noreply.github.com>
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