feat: better title font size on mobile

Author: jeffreytse

_sass/yat/_layout.scss

@@ -598,7 +598,7 @@ html {
         transition: 0.2s all;
 
         @include media-query($on-palm) {
-          @include relative-font-size(2.425);
+          @include relative-font-size(1.875);
         }
       }