adjust pages to not include manual subpage listings

content/programming/unreal-engine.tree

@@ -1,4 +1,5 @@
 %% title = "Unreal Engine"
+icon = "folder"
 
 % id = "01H8Y0CKD0ZDHAH1ET3BJNDS4E"
 - this is that really cool game engine I work with on a daily basis
@@ -8,19 +9,3 @@
 
         % id = "01H8YGXP0ZWG6X3PB6GWSGKAT0"
         - both the fun and the good, and that which ruins my mood
-
-% id = "programming/unreal-engine/blueprint"
-  content.link = "programming/unreal-engine/blueprint"
-+ :page: thoughts on Blueprint
-
-% id = "01HP1FESY5WVJG4X80AZ4ZBX5D"
-- :folder: random but cool things
-
-    % content.link = "programming/unreal-engine/generated-body"
-      id = "01HV1DGFHP6GB268MDGGDXMR12"
-    + :page: how does `GENERATED_BODY()` work exactly?
-
-    % content.link = "programming/unreal-engine/fixes"
-      id = "01HP1FESY5ZS6YTZXA8QTT5V1Z"
-    + :page: data validation quick fixes
-