added use of show-source.js

Author: arkenidar

css/theme.html

@@ -57,6 +57,9 @@ <h1>Theme Switcher Example</h1>
     <button onclick="setTheme('light')">Light Theme</button>
     <button onclick="setTheme('dark')">Dark Theme</button>
     <button onclick="setTheme('flame')">Flame Theme</button>
+
+    <hr>
+    <script src="/libs/show-source.js/show-source.js"></script>
 </body>
 
 </html>