update sdk layout

Author: cinnamon-msft

hub/dev-environment/toc.yml

@@ -127,10 +127,18 @@ items:
           href: ../powertoys/command-palette/overview.md
         - name: Developer docs
           items:
-            - name: Extensibility overview
-              href: ../powertoys/command-palette/extensibility.md
-            - name: SDK
-              href: ../powertoys/command-palette/sdk.md
+            - name: Creating an extension
+              href: ../powertoys/command-palette/creating-an-extension.md
+            - name: Command Palette SDK namespaces
+              href: ../powertoys/command-palette/sdk-namespaces.md
+            - name: Microsoft.Windows.Run
+              items:
+                - name: Microsoft.Windows.Run
+                  href: ../powertoys/command-palette/microsoft-windows-run.md
+            - name: Microsoft.Windows.Run.Extensions
+              items:
+                - name: Microsoft.Windows.Run.Extensions
+                  href: ../powertoys/command-palette/microsoft-windows-run-extensions.md
             - name: Extension samples
               href: ../powertoys/command-palette/samples.md
             - name: Publishing your extension

hub/powertoys/command-palette/extensibility.md renamed to hub/powertoys/command-palette/creating-an-extension.md

@@ -0,0 +1,17 @@
+---
+title: Command Palette SDK Namespaces
+description: The Command Palette provides a full extension model, allowing developers to create their own experiences for the palette. Find info about how to use its SDK namespaces to author an extension.
+ms.date: 2/3/2025
+ms.topic: concept-article
+no-loc: [PowerToys, Windows, Insider]
+# Customer intent: As a Windows developer, I want to learn how to use the Command Palette SDK to create an extension.
+---
+
+# Command Palette SDK namespaces
+
+This section provides detailed information about the namespaces in the Command Palette SDK.
+
+| Namespace | Description |
+| :--- | :--- |
+| [Microsoft.Windows.Run](microsoft-windows-run.md) | Contains the interfaces that developers will implement to create extensions for the Command Palette. |
+| [Microsoft.Windows.Run.Extensions](microsoft-windows-run-extensions.md) | Contains helper classes that developers can use to make creating extensions easier. |