remove newcomer examples in v12 (#1025)

Author: jderochervlk

data/sidebar_manual_v1200.json

@@ -9,7 +9,6 @@
   "Guides": [
     "converting-from-js",
     "editor-code-analysis",
-    "newcomer-examples",
     "project-structure"
   ],
   "JavaScript Interop": [