security: remove polyfill.io script tag from public/index.html

The polyfill.io domain was compromised in 2024 and used to inject
malicious JavaScript via CDN responses. All loaded features (replaceAll,
IntersectionObserver, map, reduce) are natively supported by all modern
browsers — no alternative needed.

Author: sinatragianpaolo

public/index.html

@@ -79,7 +79,6 @@
       type="text/css"
       media="all"
     />
-    <script src="https://polyfill.io/v3/polyfill.min.js?features=String.prototype.replaceAll%2CIntersectionObserver%2CArray.prototype.map%2CArray.prototype.reduce"></script>
     <script
       type="text/javascript"
       src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDy8e6_8uv8JnNZFRXng6HfbhnhvobWyac&libraries=places"