Menu fixes, remove unused pages

pages/_data/menu.yml

@@ -1,7 +1,13 @@
-apps:
+form-elements:
   url: form-elements.html
   title: Form elements
   icon: check-square
+
+charts:
+  url: charts.html
+  title: Charts
+  icon: pie-chart
+
 level-1:
   title: Level 1
   icon: menu
@@ -14,6 +20,7 @@ level-1:
           children:
             level-4:
               title: Level 4
+
 layout:
   title: Layout
   icon: layout
@@ -45,7 +52,4 @@ changelog:
   icon: file-plus
   label: v1.0.0
 
-getting-started:
-  url: getting-started.html
-  title: Getting started
-  icon: start
+