Lazy load Maplibre GL JS and add hillshading layer

layers/config/config.js

@@ -15,7 +15,7 @@ BR.confLayers.languageDefaultLayers = [
 ];
 
 BR.confLayers.defaultOverlays =  [
-    'HikeBike.HillShading',
+    'terrarium-hillshading',
     'Waymarked_Trails-Cycling',
     'Waymarked_Trails-Hiking'
 ];

layers/config/tree.js

@@ -68,7 +68,7 @@ BR.confLayers.tree = {
     },
     'overlays': {
         'worldwide': [
-            'HikeBike.HillShading',
+            'terrarium-hillshading',
             'Waymarked_Trails-Cycling',
             'Waymarked_Trails-Hiking',
             'Waymarked_Trails-MTB',

layers/mvt/terrarium-hillshading-style.json

@@ -0,0 +1,21 @@
+{
+    "version": 8,
+    "sources": {
+        "dem": {
+            "type": "raster-dem",
+            "tiles": [
+                "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png"
+            ],
+            "encoding": "terrarium",
+            "tileSize": 256,
+            "maxzoom": 15
+        }
+    },
+    "layers": [
+        {
+            "id": "hillshading",
+            "source": "dem",
+            "type": "hillshade"
+        }
+    ]
+}

layers/mvt/terrarium-hillshading.geojson

@@ -0,0 +1,15 @@
+{
+    "geometry": null,
+    "properties": {
+        "attribution": {
+            "text": "Terrain Tiles from AWS",
+            "url": "https://registry.opendata.aws/terrain-tiles/"
+        },
+        "id": "terrarium-hillshading",
+        "name": "Hillshading",
+        "overlay": true,
+        "type": "mvt",
+        "url": "terrarium-hillshading-style"
+    },
+    "type": "Feature"
+}