[client] Try tweaking the heatmap, but it looks like we're going to have to swap it out

Looks like https://www.npmjs.com/package/leaflet-heatmap is a good place 
to look for a replacement

client_src/js/Config.mjs

@@ -9,7 +9,8 @@ export default {
 	default_zoom: 12,
 	
 	// The size, in metres, of the blobs on the heatmap.
-	heatmap_blob_size: 500,
+	heatmap_blob_size: 5000,
 	
-	heatmap_opacity: 0.75
+	heatmap_opacity: 0.75,
+	heatmap_alpha_range: 0.5
 }

client_src/js/LayerHeatmap.mjs

@@ -13,7 +13,8 @@ class LayerHeatmap {
 		
 		this.layer = new L.webGLHeatmap({
 			size: Config.heatmap_blob_size,
-			opacity: Config.heatmap_opacity
+			opacity: Config.heatmap_opacity,
+			alphaRange: Config.heatmap_alpha_range
 		});
 	}