docs: Improve documentation at Klondike Tutorial Step 5

doc/tutorials/klondike/step5.md

@@ -413,9 +413,41 @@ FlameGame. The new world contains (almost) everything we need to play the game a
 re-created during each of the above actions.
 
 
-### A stripped-down KlondikeGame class
+### KlondikeWorld Class
 
-Here is the new code for the KlondikeGame class (what is left of it).
+
+#### Introduction to `World` in Flame
+
+In Flame, `World` is a special type of `Component` that can contain other `Components`,
+such as Piles in the Klondike game. Think of `World` as the playground where everything 
+happens—dealing cards, arranging them, and player actions.
+
+You can learn more about `World` in game programming here:
+
+- An introduction to `World` in game programming: [Ecampus](https://ecampusontario.pressbooks.pub/gamedesigndevelopmenttextbook/chapter/what-is-a-game-world/)
+- The concept of `World` in Flame: [Flame Docs](https://docs.flame-engine.org/latest/flame/camera_component.html#world)
+
+We won’t go too deep here; just understand that `World` is where everything is managed in the game.
+
+
+#### Creating `KlondikeWorld`
+
+Let’s dive in! When the game starts, we’ll create a new “World” called `KlondikeWorld` to hold
+ all the components of the game. Each new game round will create a new `World`—like resetting the playing
+  field every time a new game starts. This ensures that everything is set up from
+  scratch, keeping the game fresh.
+
+
+### Transitioning from `KlondikeGame` to `KlondikeWorld`
+
+
+Previously, `KlondikeGame` managed all `Piles` and `Cards`. However, in step 5, we move this responsibility to 
+`KlondikeWorld` for better separation of concerns and cleaner code organization. This change improves the 
+structure by adhering to object-oriented programming principles, allowing for more modular and maintainable code.
+
+#### Updating the `KlondikeGame` Class
+
+Now, we modify the `KlondikeGame` class to utilize `KlondikeWorld` instead of Flame's default `World`. Here’s the new structure:
 
 ```dart
 enum Action { newDeal, sameDeal, changeDraw, haveFun }
@@ -435,27 +467,28 @@ class KlondikeGame extends FlameGame<KlondikeWorld> {
   );
 
   // Constant used when creating Random seed.
-  static const int maxInt = 0xFFFFFFFE; // = (2 to the power 32) - 1
+  static const int maxInt = 0xFFFFFFFE;
 
-  // This KlondikeGame constructor also initiates the first KlondikeWorld.
+  // Constructor initiates the first KlondikeWorld.
   KlondikeGame() : super(world: KlondikeWorld());
 
-  // These three values persist between games and are starting conditions
-  // for the next game to be played in KlondikeWorld. The actual seed is
-  // computed in KlondikeWorld but is held here in case the player chooses
-  // to replay a game by selecting Action.sameDeal.
+  // These values persist between games and are used as starting conditions
+  // for the next game in KlondikeWorld.
   int klondikeDraw = 1;
   int seed = 1;
   Action action = Action.newDeal;
 }
 ```
 
-Huh! What happened to the `onLoad()` method? And what's this `seed` thing? And how does
-KlondikeWorld get into the act? Well, everything that used to be in the `onLoad()` method is now
-in the `onLoad()` method of KlondikeWorld, which is an extension of the `World` class and is a type
-of `Component`, so it can have an `onLoad()` method, as can any `Component` type. The content of
-the method is much the same as before, except that `world.add(` becomes just `add(`. It also brings
-in some `addButton()` references, but more on these later.
+#### Explanation of Changes
+
+Ohhh, so what happened to the `onLoad()` method? Well, previously, `KlondikeGame` handled everything in the `onLoad()` method, managing all the game components like `Piles` and `Cards`. But now, to make things cleaner and more organized, we’ve moved that responsibility over to `KlondikeWorld`. 
+
+Everything that used to be inside the `onLoad()` method of `KlondikeGame` is now in `KlondikeWorld`'s `onLoad()` method. This keeps the code more modular, meaning it's easier to maintain and update. Instead of `KlondikeGame` getting messy with too many tasks, we let `KlondikeWorld` handle the game setup and logic.
+
+And what’s this `seed` thing? Ah, good question! So, the `seed` attribute is like a magic key. It lets you replay the same game configuration by selecting `Action.sameDeal`. This is super useful when you want to give players the option to retry the exact same game setup. The `seed` ensures that the randomness in the game (like card shuffling) can be repeated exactly the same way. Think of it as a way to recreate the same starting point in a game.
+
+So, with the `seed` safely stored in `KlondikeGame`, the `KlondikeWorld` can use it to keep everything consistent between rounds. If you choose `Action.sameDeal`, it will load the same shuffled deck and game state, letting you replay that round with the same starting conditions. Pretty cool, right?
 
 
 ### Using a Random Number Generator seed
@@ -466,21 +499,6 @@ reproducible behavior when you are in the development and testing stage. Here it
 provide exactly the same deal of the Klondike cards when the player requests `Same deal`.
 
 
-### Introducing the new KlondikeWorld class
-
-The `class KlondikeGame` declaration specifies that this extension of the FlameGame class must
-have a world of type KlondikeWorld (i.e. `FlameGame<KlondikeWorld>`). Didn't know we could do
-that for a game, did we? So how does the first instance of KlondikeWorld get created? It's all in
-the KlondikeGame constructor code:
-
-```dart
-  KlondikeGame() : super(world: KlondikeWorld());
-```
-
-The constructor itself is a default constructor, but the colon `:` begins a constructor
-initialization sequence which creates our world for the first time.
-
-
 ### Buttons
 
 We are going to use some buttons to activate the various ways of restarting the Klondike Game. First