Chalk: add font-smoothing to reset.css (#10140)

packages/theme-chalk/src/reset.scss

@@ -5,6 +5,7 @@ body {
   font-weight: 400;
   font-size: $--font-size-base;
   color: $--color-black;
+  -webkit-font-smoothing: antialiased;
 }
 
 a {
@@ -75,4 +76,4 @@ hr {
   margin-bottom: 20px;
   border: 0;
   border-top: 1px solid #eeeeee;
-}
+}