Add cross-links to other agent-lab language editions

Added 'Also available in...' links to the hero section of index.html, linking to the other three language editions of the agent lab workshop.

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

Author: brunoborges

docs/index.html

@@ -32,6 +32,7 @@ <h1>VS Code GitHub Copilot Agent Lab</h1>
                     📦 GitHub Repo
                 </a>
             </div>
+            <p class="hero-also">Also available in <a href="https://copilot-dev-days.github.io/agent-lab-dotnet/">.NET</a>, <a href="https://copilot-dev-days.github.io/agent-lab-java/">Java</a>, and <a href="https://copilot-dev-days.github.io/agent-lab-typescript/">TypeScript</a></p>
             <div class="stats">
                 <div class="stat">
                     <div class="stat-value">~1hr</div>

docs/styles.css

@@ -337,3 +337,20 @@ footer {
         margin-top: 0.5rem;
     }
 }
+
+.hero-also {
+    margin-top: 1rem;
+    font-size: 0.95rem;
+    color: var(--text-secondary);
+}
+
+.hero-also a {
+    color: var(--neon-cyan);
+    text-decoration: none;
+    transition: color 0.3s ease;
+}
+
+.hero-also a:hover {
+    color: var(--neon-magenta);
+    text-decoration: underline;
+}