Remove marketing margin extension

Author: tobiasahlin

src/marketing/utilities/margin.scss

@@ -1,24 +1,4 @@
 // Margin spacer utilities for marketing
-// Utilities only added for y-direction margin (i.e. top & bottom)
-
-@each $breakpoint, $variant in $responsive-variants {
-  @include breakpoint($breakpoint) {
-    @each $scale, $size in $spacer-map-extended {
-
-      .mt#{$variant}-#{$scale} { margin-top: $size !important; }
-      .mb#{$variant}-#{$scale} { margin-bottom: $size !important; }
-
-      .mt#{$variant}-n#{$scale} { margin-top: -$size !important; }
-      .mb#{$variant}-n#{$scale} { margin-bottom: -$size !important; }
-
-      .my#{$variant}-#{$scale} {
-        margin-top: $size !important;
-        margin-bottom: $size !important;
-      }
-    }
-  }
-}
-
 .mt-auto {
   margin-top: auto !important;
 }