fix: switch map tiles to CartoDB dark (no API key required)

themes/intotheeast/templates/dailies.html.twig

@@ -28,10 +28,9 @@
 var FEED_ENTRIES = {{ map_entries|json_encode|raw }};
 
 var map = L.map('feed-map', { minZoom: 2, maxZoom: 18, zoomControl: true });
-// TODO: add Stadia API key before launch — free dev use requires no key, production does
-L.tileLayer('https://tiles.stadiamaps.com/tiles/alidade_smooth_dark/{z}/{x}/{y}{r}.png', {
+L.tileLayer('https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png', {
     maxZoom: 20,
-    attribution: '© <a href="https://stadiamaps.com/">Stadia Maps</a> © <a href="https://openmaptiles.org/">OpenMapTiles</a> © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
+    attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors © <a href="https://carto.com/attributions">CARTO</a>'
 }).addTo(map);
 
 var latLngs = FEED_ENTRIES.map(function(e) { return [parseFloat(e.lat), parseFloat(e.lng)]; });