Removed duplicate entires from Summary.md file

Author: eshanrnh

16/umbraco-cms/SUMMARY.md

@@ -157,22 +157,6 @@
     * [Extension Manifest](customizing/extending-overview/extension-registry/extension-manifest.md)
     * [Replace, Exclude or Unregister](customizing/extending-overview/extension-registry/replace-exclude-or-unregister.md)
   * [Extension Types](customizing/extending-overview/extension-types/README.md)
-    * [Sections](customizing/extending-overview/extension-types/sections/README.md)
-      * [Sections](customizing/extending-overview/extension-types/sections/section.md)
-      * [Section Sidebar](customizing/extending-overview/extension-types/sections/section-sidebar.md)
-      * [Section View](customizing/extending-overview/extension-types/sections/section-view.md)
-    * [Workspaces](customizing/extending-overview/extension-types/workspaces/README.md)
-      * [Workspace Actions](customizing/extending-overview/extension-types/workspaces/workspace-editor-actions.md)
-      * [Workspace Action Menu Items](customizing/extending-overview/extension-types/workspaces/workspace-action-menu-items.md)
-      * [Workspace Context](customizing/extending-overview/extension-types/workspaces/workspace-context.md)
-      * [Workspace Views](customizing/extending-overview/extension-types/workspaces/workspace-views.md)
-      * [Workspace Footer Apps](customizing/extending-overview/extension-types/workspaces/workspace-footer-apps.md)
-    * [Menu](customizing/extending-overview/extension-types/menu.md)
-    * [Header Apps](customizing/extending-overview/extension-types/header-apps.md)
-    * [Icons](customizing/extending-overview/extension-types/icons.md)
-    * [Block Custom View](customizing/extending-overview/extension-types/block-custom-view.md)
-    * [Bundle](customizing/extending-overview/extension-types/bundle.md)
-    * [Kind](customizing/extending-overview/extension-types/kind.md)
     * [App Entry Point](customizing/extending-overview/extension-types/app-entry-point.md)
     * [Backoffice Entry Point](customizing/extending-overview/extension-types/backoffice-entry-point.md)
     * [Block Custom View](customizing/extending-overview/extension-types/block-custom-view.md)
@@ -200,8 +184,10 @@
     * [Trees](customizing/extending-overview/extension-types/tree.md)
     * [Workspaces](customizing/extending-overview/extension-types/workspaces/README.md)
       * [Workspace Actions](customizing/extending-overview/extension-types/workspaces/workspace-editor-actions.md)
+      * [Workspace Action Menu Items](customizing/extending-overview/extension-types/workspaces/workspace-action-menu-items.md)
       * [Workspace Context](customizing/extending-overview/extension-types/workspaces/workspace-context.md)
       * [Workspace Views](customizing/extending-overview/extension-types/workspaces/workspace-views.md)
+      * [Workspace Footer Apps](customizing/extending-overview/extension-types/workspaces/workspace-footer-apps.md)
   * [Extension Kind](customizing/extending-overview/extension-kind.md)
   * [Extension Conditions](customizing/extending-overview/extension-conditions.md)
   * [Custom Extension types](customizing/extending-overview/custom-extension-type.md)