[Dev docs] Update navigation bar (#1585)

docs/_data/nav_development.yml

@@ -1,8 +1,6 @@
 - title: Introduction
   items:
   - overview
-  - structure
-  - components
   - how-to-develop
   - how-to-debug
 - title: Threading
@@ -14,10 +12,6 @@
 - title: Layout System
   items:
   - layout-specs
-  - automatic-subnode-layout
-  - layout-transitions
 - title: Collections
   items:
   - collection-asynchronous-updates
-  - collection-animations
-  - cell-node-lifecycle