fix: license badge in the deployed demo/docs page was missed in the relicense

The root README/LICENSE/package.json were updated, but this repo also ships
a separate demo/docs Angular app (deployed to GitHub Pages) with its own
badge markup — untouched by that pass, still showing the old license.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: hhfrancois

demo/index.html

@@ -463,7 +463,7 @@
             <h1>@softwarity/interactive-code</h1>
             <div class="badges">
               <img src="https://img.shields.io/npm/v/@softwarity/interactive-code.svg" alt="npm version">
-              <img src="https://img.shields.io/badge/license-MIT-blue" alt="license">
+              <img src="https://img.shields.io/badge/license-Apache--2.0-blue" alt="license">
             </div>
           </div>
         </div>