[design] change preset theme

Author: zombieFox

src/js/theme.js

@@ -1196,7 +1196,7 @@ var theme = (function(){
 style: "normal"
 },
 ui: {
-name: "Baskervville",
+name: "Montserrat",
 weight: 400,
 style: "normal"
 }
@@ -1214,7 +1214,7 @@ var theme = (function(){
 },
 contrast: {
 light: 4.5,
-dark: 4.5
+dark: 4
 }
 },
 accent: {