adjust pages to not include manual subpage listings

content/programming/cxx.tree

@@ -1,13 +1,5 @@
 %% title = "C++"
+icon = "folder"
 
 % id = "01H9R1KJESR2F420HE67HW4AVR"
 - notes and design lessons from the best programming language of all time that everyone loves (not really)
-
-% content.link = "programming/cxx/access-modifiers-as-labels"
-  redirect_from = ["programming/cxx/access-modifiers-as-labels"]
-  id = "01H9R1KJESGGM35KT8ANEA2B9Q"
-+ :page: access modifiers as labels (`private:`, `protected:`, and `public:`)
-
-% content.link = "programming/cxx/shared-unique-ptr-deleter"
-  id = "01J0VN48AZYH6KJGK7PSKN0PCA"
-+ :page: freeing C memory automatically using `std::unique_ptr` and `std::shared_ptr`

content/programming/lvalues.tree

@@ -1,4 +1,4 @@
-%% title = "places, or what is up with *x not always meaning the same thing in different contexts"
+%% title = "places, or what is up with `*x` not always meaning the same thing in different contexts"
 
 % id = "01HY5R1ZV9DD7BV0F66Y0DHAEA"
 - I recently got a question from my someone telling me they doesn't understand why `*x` does not read from the pointer `x` when on the left-hand side of an assignment.

content/programming/opinions.tree

@@ -1,4 +1,5 @@
 %% title = "Hotland - Bad Opinion Zone"
+icon = "folder"
 
 % id = "01HBTSXTTAAAHGKD4TZZW14KFK"
 - ``` =html

content/programming/opinions/refcell.tree

@@ -1,4 +1,4 @@
-%% title = "don't use RefCell<T>"
+%% title = "don't use `RefCell<T>`"
 
 % id = "01HCD90XT3X82R37WTJJABZF4Y"
 + usually if you have to resort to [`RefCell<T>`](https://doc.rust-lang.org/std/cell/struct.RefCell.html), it means something is wrong with your architecture

content/programming/projects.tree

@@ -1,3 +1,5 @@
+%% visibility = "Private"
+
 % id = "01JEM34P6VYJWAPSJN1WB1WBJZ"
 - note: I haven't updated this in a while, because I hardly ever do projects outside the treehouse nowadays ---w---
 

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
-