Removed paragraph margin gap styles. They no longer seem to be needed. (#4845)

* Removed paragraph margin gap styles.  They no longer seem to be needed.

* Add back needed paragraph styles

* add back missing file

Co-authored-by: Ben Dwyer <ben@scruffian.com>

blockbase/assets/ponyfill.css

@@ -226,10 +226,6 @@ p {
 	margin-bottom: 1em;
 }
 
-.wp-block-column :first-child, .wp-block-group :first-child {
-	margin-top: 0;
-}
-
 .image-no-margin {
 	margin: 0;
 }

blockbase/sass/base/_text.scss

@@ -5,9 +5,3 @@ p {
 	margin-top: 1em;
 	margin-bottom: 1em;
 }
-
-.wp-block-column, .wp-block-group {
-	:first-child {
-		margin-top: 0;
-	}
-}