upstream master into part cover

themes/assets/assets.less

@@ -15,7 +15,7 @@
 @horizontalRule           : url('/assets/horizontalRule.svg');
 @partCoverHeaderPHB       : url('/assets/partCoverHeaderPHB.png');
 @partCoverHeaderDMG       : url('/assets/partCoverHeaderDMG.svg');
-
+@scriptBorder             : url('/assets/scriptBorder.png');
 
 // Watercolor Images
 @watercolor1  : url('/assets/watercolor/watercolor1.png');