Add link to try the app in the workshop section

Author: jamesmontemagno

docs/index.html

@@ -363,6 +363,9 @@ <h1>VS Code GitHub Copilot Agent Lab</h1>
                 <a href="step.html?step=00-overview" class="btn btn-primary">
                     🚀 Start Workshop
                 </a>
+                <a href="https://dotnet-presentations.github.io/vscode-github-copilot-agent-lab/app" class="btn btn-secondary">
+                    🎮 Try the App
+                </a>
                 <a href="https://github.com/dotnet-presentations/vscode-github-copilot-agent-lab" class="btn btn-secondary">
                     📦 GitHub Repo
                 </a>