Update Learning Hub: Customize, Agent Merge, VS Code Agents window updates (#2917)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

website/src/content/docs/learning-hub/github-copilot-app.md

@@ -3,7 +3,7 @@ title: 'Getting Started with the GitHub Copilot app'
 description: 'Learn about the GitHub Copilot app, a desktop experience built for agent-native development. Understand its key features and who it''s for.'
 authors:
   - GitHub Copilot Learning Hub Team
-lastUpdated: 2026-08-28
+lastUpdated: 2026-09-02
 estimatedReadingTime: '8 minutes'
 tags:
   - copilot-app
@@ -82,6 +82,16 @@ Closing the app's main window keeps it running in the background instead of quit
 
 For a hands-on guide to building canvases with `/create-canvas`, see [Working with Canvas Extensions](../working-with-canvas-extensions/).
 
+### Customize
+
+**Customize** *(v1.1.13+)* is a single place in the Copilot app to browse and manage everything that extends your agents: plugins, skills, MCP servers, and canvases. Instead of hunting through separate settings pages, open **Customize** to:
+
+- Browse **Featured** integrations (for example Azure DevOps or Figma) and install them with one click
+- See what's already **Installed**, with consistent icons and source labels across plugin, skill, MCP server, canvas, and connector types
+- Create, edit, or remove your own **personal skills** directly in the app, without hand-authoring a `SKILL.md` file
+
+This makes Customize a good starting point if you want to extend the app's capabilities but don't need the full `copilot plugin` CLI workflow described in [Installing and Using Plugins](../installing-and-using-plugins/).
+
 ### Agent Merge
 
 **Agent Merge** is a feature that can carry your pull requests through the entire workflow: