Enable font smoothing. (#664)

Author: kattni

assets/static/beeware.css

@@ -341,6 +341,11 @@ blockquote {
 /*----------------------------------------------------
   Navigation menu styles
  --------------------------------------------------- */
+body {
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+}
+
 .dropdown-pull-right {
   float: right !important;
   right: 0;