- removed Install Info handlers;

- updated handlers for the wp-admin settings;
- avoid double generate sections (hidden process);
- nav tabs and subtabs using WordPress native CSS;

assets/css/admin/settings.sass

@@ -2,13 +2,13 @@
 @import "mixins"
 @import "colors"
 
-##{$prefix}settings-wrap
-  .subsubsub
-    +flex( row, flex-start, center, wrap )
-    margin-left: -3px
-    margin-right: -3px
-    a
-      margin: 0 3px
+//##{$prefix}settings-wrap
+//  .subsubsub
+//    +flex( row, flex-start, center, wrap )
+//    margin-left: -3px
+//    margin-right: -3px
+//    a
+//      margin: 0 3px
 
 .#{$prefix}settings-section
   .description