fixes map attribution && adds OpenFreeMap

web/static/styles/osm.json

@@ -1,22 +0,0 @@
-{
-    "version": 8,
-    "sources": {
-        "osm-tiles": {
-            "type": "raster",
-            "tiles": [
-                "https://tile.openstreetmap.org/{z}/{x}/{y}.png"
-            ],
-            "tileSize": 256
-        }
-    },
-    "glyphs": "https://tiles.basemaps.cartocdn.com/fonts/{fontstack}/{range}.pbf",
-    "layers": [
-        {
-            "id": "osm-tiles",
-            "type": "raster",
-            "source": "osm-tiles",
-            "minzoom": 0,
-            "maxzoom": 19
-        }
-    ]
-}

web/static/styles/otm.json

@@ -6,7 +6,8 @@
             "tiles": [
                 "https://tile.opentopomap.org/{z}/{x}/{y}.png"
             ],
-            "tileSize": 256
+            "tileSize": 256,
+            "attribution": "© OpenTopoMap"
         }
     },
     "glyphs": "https://tiles.basemaps.cartocdn.com/fonts/{fontstack}/{range}.pbf",