removing breakpoint CSS custom properties

I'm not using them for anything and they are causing problems for the unit test css

Author: Dan503

src/_styles/00-config-files/03-BPs-MQs/00-bp-break-points-base.scss

@@ -22,9 +22,3 @@ $breakpoints: (
 	large: $BP-large,
 	page: $BP-page,
 )
-
-:root {
-	@each $name, $value in $breakpoints {
-		--BP-#{$name}: $value;
-	}
-}