Standardize docs site to tailspin template

Align HTML/CSS/JS structure with the tailspin-toys-workshop docs template:
- Use shared external styles.css, light-theme.css, theme-toggle.js
- Standardize step.html with consistent sidebar, header nav, markdown rendering
- Use .markdown class naming, colored GitHub alerts, image path resolution
- Add theme toggle in header, confetti on last step, keyboard navigation

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

Author: brunoborges

docs/index.html

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>App Modernization with GitHub Copilot</title>
     <link rel="preconnect" href="https://fonts.googleapis.com">
-    <link href="https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap" rel="stylesheet">
+    <link href="https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap" rel="stylesheet">
     <link rel="stylesheet" href="styles.css">
     <link rel="stylesheet" href="light-theme.css">
     <script src="theme-toggle.js"></script>
@@ -25,7 +25,7 @@ <h1>App Modernization with GitHub Copilot</h1>
             </div>
             <div class="stats">
                 <div class="stat">
-                    <div class="stat-value">~1hr</div>
+                    <div class="stat-value">~60min</div>
                     <div class="stat-label">Duration</div>
                 </div>
                 <div class="stat">
@@ -126,7 +126,6 @@ <h3>Containerize Applications</h3>
                         <h3>Copilot Prompts Guide</h3>
                         <p>Reference guide with prompts used during development</p>
                     </div>
-                    <span class="part-time">—</span>
                 </a>
             </div>
         </div>
@@ -161,7 +160,7 @@ <h2 class="section-title">Prerequisites</h2>
             <div class="footer-links">
                 <a href="https://github.com/copilot-dev-days/appmod-workshop-java" target="_blank">GitHub Repository</a>
                 <a href="https://docs.github.com/en/copilot" target="_blank">Copilot Docs</a>
-                <a href="https://github.com/iCSJ/awesome-copilot" target="_blank">Awesome Copilot</a>
+                <a href="https://github.com/github/awesome-copilot" target="_blank">Awesome Copilot</a>
             </div>
             <p class="footer-credit">Built with 💜 by the GitHub Copilot Team</p>
         </div>