Add pmtiles styling experiment to root index.html

index.html

@@ -99,6 +99,7 @@ <h2>Styling</h2>
         <li><a href="styling/alternate-styles/">Alternate basemap styles</a>
         <li><a href="styling/media-queries/">Media query for preferred content type</a>
         <li><a href="vector-tiles/mapml/web-map/">MapML vector tiles styled with external CSS stylesheet</a>
+        <li><a href="vector-tiles/pmtiles/">pmtiles / Mapbox vector tiles styled with application/pmtiles+stylesheet style module</a>
         <li><a href="styling/dark-mode.html">Dark mode</a></li>
       </ul>
     </section>