- 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.css

@@ -1,14 +1,3 @@
-#um-settings-wrap .subsubsub {
-  display: flex;
-  flex-direction: row;
-  justify-content: flex-start;
-  align-items: center;
-  flex-wrap: wrap;
-  margin-left: -3px;
-  margin-right: -3px; }
-  #um-settings-wrap .subsubsub a {
-    margin: 0 3px; }
-
 .um-settings-section .description {
   font-style: italic; }