* use descriptive docs btn naming
* rename `btn-bd-yellow` to `btn-bd-download`
* sort state vars
* sort state vars
* info, warning, danger
* rename btn-bd-purple
* rename `.btn-bd-purple` to `.btn-bd-primary`
* align docs color variables
* generate $bd-purple-light color
* with http://razorltd.github.io/sasscolourfunctioncalculator/
* allow overide of docs variables
* use a trailing slash when possible
* use https when possible
* remove a few redirected links
* consistently use `https://popper.js.org/`
* fix `iconUrl` in nuget files
* change Jekyll Windows guide to the official one