Remove text-rendering

less/type.less

@@ -62,7 +62,6 @@ h1, h2, h3, h4, h5, h6 {
   font-weight: @headingsFontWeight;
   line-height: @baseLineHeight;
   color: @headingsColor;
-  text-rendering: optimizelegibility; // Fix the character spacing for headings
   small {
     font-weight: normal;
     line-height: 1;