Add game links to workshop landing page and step viewer

- Add 🎮 Play Game button on docs/index.html hero section
- Convert ../game/ relative links in markdown to absolute game/ path
  so they work when rendered inside the step.html viewer

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

Author: brunoborges

docs/index.html

@@ -145,6 +145,7 @@ <h1>VS Code GitHub Copilot Agent Lab</h1>
             </p>
             <div class="hero-cta">
                 <a href="step.html?step=00-overview" class="btn btn-primary">🚀 Start Workshop</a>
+                <a href="game/" class="btn btn-secondary">🎮 Play Game</a>
                 <a href="https://github.com/copilot-dev-days/agent-lab-typescript" class="btn btn-secondary">📦 GitHub Repo</a>
             </div>
             <div class="stats">

docs/step.html

@@ -337,6 +337,9 @@
             md = md.replace(/👉 \*\*\[Continue to[^\n]+/g, '');
             md = md.replace(/👉 \*\*\[Start with[^\n]+/g, '');
 
+            // Convert relative game link to absolute
+            md = md.replace(/\]\(\.\.\/game\/\)/g, '](game/)');
+
             // Convert internal markdown links to step viewer links
             md = md.replace(/\]\((\d+)-([^)]+)\.md\)/g, '](step.html?step=$1-$2)');
             md = md.replace(/\]\(GUIDE\.md\)/g, '](step.html?step=guide)');