[bot] Update Learning Hub for /plugins removal, MCP 2026-07-28, hook trace context, and copilot app command (#2851)

* Update Learning Hub for Copilot CLI v1.0.81 changes

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Aaron Powell <me@aaron-powell.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+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: 2026-08-07
+lastUpdated: 2026-08-28
 estimatedReadingTime: '8 minutes'
 tags:
   - copilot-app
@@ -159,6 +159,8 @@ Each session runs in its own worktree with its own isolated environment. You can
 
 ### Launching Sessions from the Terminal with Deep Links
 
+> **New (v1.0.81+)**: Run `copilot app` from GitHub Copilot CLI to open the GitHub Copilot app directly in the current directory — a quicker alternative to constructing a deep link by hand when you just want to hand off your current working directory to the desktop app.
+
 The GitHub Copilot app supports URL deep links. This is useful when you want to open the app or start a session directly from your terminal workflow.
 
 Supported schemes: