Upgrades maplibre-gl to v6.10.0 and modernizes script loading

assets/openfreemap.js

@@ -0,0 +1,30 @@
+import * as maplibregl from '../vendor/maplibre-gl/maplibre-gl.mjs';
+
+document.querySelectorAll('.openfreemap').forEach((container) => {
+  const center = [
+    parseFloat(container.dataset.lon),
+    parseFloat(container.dataset.lat)
+  ];
+  const zoom = parseFloat(container.dataset.zoom);
+  const map = new maplibregl.Map({
+    style: container.dataset.style,
+    center: center,
+    zoom: zoom,
+    container: container
+  });
+  const marker = new maplibregl.Marker({
+    color: container.dataset.color
+  })
+    .setLngLat(center)
+    .addTo(map);
+  const popupText = container.dataset.popup;
+  if (popupText) {
+    const popup = new maplibregl.Popup({
+      closeOnClick: false
+    }).setHTML(popupText);
+    marker.setPopup(popup);
+    marker.togglePopup();
+  }
+  map.addControl(new maplibregl.NavigationControl());
+});
+