Upgrade dependencies, including OL7.1→8.2

layers/index.js

@@ -1,6 +1,6 @@
 import TileLayer from 'ol/layer/Tile';
 import OSM from 'ol/source/OSM';
-import Stamen from 'ol/source/Stamen.js';
+import StadiaMaps from 'ol/source/StadiaMaps.js';
 
 import chandlerLayer from './chandler/layer.js';
 import amtrakLayer from './amtrak/layer.js';
@@ -42,16 +42,16 @@ const layerCategories = [
             {
                 name: "Stamen Watercolor (Raster)",
                 layer: new TileLayer({
-                    source: new Stamen({
-                        layer: 'watercolor',
+                    source: new StadiaMaps({
+                        layer: 'stamen_watercolor',
                     }),
                 }),
             },
             {
                 name: "Stamen Toner (Raster)",
                 layer: new TileLayer({
-                    source: new Stamen({
-                        layer: 'toner',
+                    source: new StadiaMaps({
+                        layer: 'stamen_toner',
                     }),
                 }),
             },