feat(style): simplify default user styles

_app/assets/_less/user.less

@@ -4,34 +4,49 @@
 // All other vaiables in `variables.less` can be overwritten below
 // NOTE: the following user styles are designed for default theme Curtana
 
+//
 // EXAMPLE: alternative title size
+//
 // By default all heading levels have the same font size, but many people may
 // not like this, so here's an alternative font size stack:
-.content {
-  h2 { font-size: 108%; opacity: .8; }
-  h3 { font-size: 96%;  opacity: .7; }
-  h4 { font-size: 84%;  opacity: .6; }
-  h5 { font-size: 72%;  opacity: .5; }
-  h6 { font-size: 60%;  opacity: .4; }
-}
+//
+// .content {
+//   h2 { font-size: 108%; opacity: .8; }
+//   h3 { font-size: 96%;  opacity: .7; }
+//   h4 { font-size: 84%;  opacity: .6; }
+//   h5 { font-size: 72%;  opacity: .5; }
+//   h6 { font-size: 60%;  opacity: .4; }
+// }
 
+//
 // EXAMPLE: alternative post title color
 // This is useful when you're using the custom color scheme.
+//
 // .content { .list h2 a, header h1, header h1 a { color: @link-color; } }
 // .external span { background: @link-color; }
 
+//
 // EXAMPLE: custom header with background image
+//
 // .content header {
 //   color: @background-color;
 //   background: @link-color url('/assets/img/title-background-example.jpg') center center / cover;
 // }
 
+//
+// EXAMPLE: Custom typography for Chinese Traditional
+//
+// @fontstack-sans-serif: "Helvetica Neue", "Hiragino Sans GB", Arial, sans-serif;
+// @fontstack-serif: Georgia, "Hiragino Mincho ProN", serif;
+
+//
 // EXAMPLE: amsf.github.io custom variables
-@fontstack-sans-serif: "Helvetica Neue", "Hiragino Sans GB", Arial, sans-serif;
-@fontstack-serif: Georgia, "Hiragino Mincho ProN", serif;
+//
 @link-color: #ff00b4;
 
+//
 // EXAMPLE: custom SVG title for https://sparanoid.com/lab/amsf/
+//
 .amsf-title {
   text-indent: -999999px;
   line-height: 0 !important;