Added page on dynamic layers

docs/.vitepress/config.js

@@ -62,7 +62,8 @@ module.exports = {
         {
           text: "Advanced Concepts",
           children: [
-            { text: "Creating Features", link: "/guide/creating-features" }
+            { text: "Creating Features", link: "/guide/creating-features" },
+            { text: "Dynamic Layers", link: "/guide/dynamic-layers" }
           ]
         }
       ],

docs/guide/dynamic-layers.md

@@ -0,0 +1,13 @@
+# Dynamic Layers
+
+You can dynamically add and remove layers using the `addLayer` and `removeLayer` functions. Note that removing a layer does not change the player save data in any way, so you can safely add and remove the same layer. In fact, there is a `reloadLayer` to do just that, which is used for when the structure of a layer changes - e.g., adding a new feature.
+
+If you're going to be procedurally generating layers, all with a similar structure, it might make sense to use a utility function like the following in order to easily access a correctly typed reference to a layer with a given ID:
+
+```ts
+function getDynLayer(id: string): DynamicLayer {
+  const layer = layers[id];
+  if (!layer) throw "Layer does not exist";
+  return layer as DynamicLayer; // you might need an "as unknown" after layer
+}
+```