refactor(Progress): improve syntax

Author: mrholek

scss/_progress.scss

@@ -76,20 +76,7 @@
 }
 
 .progress-group-icon {
-  margin: 0 $spacer 0 ($spacer * .25);
   font-size: $font-size-lg;
-
-  // @include ltr {
-  //   margin: 0 $spacer 0 ($spacer * .25);
-  // }
-  // @include rtl {
-  //   margin: 0 ($spacer * .25) 0 $spacer;
-  // }
-}
-
-.progress-group-text {
-  font-size: $font-size-sm;
-  color: $gray-700;
 }
 
 .progress-group-header {