Add Menards layer

Most of this was stolen from prior work:

6c4c2aa9ae

The one thing that took me an unreasonably long time to figure out was
that SVGs without width/height don't work (correctly? at all?) in
OpenLayers. Possibly due to this issue?:

https://github.com/openlayers/openlayers/issues/14196

Anyway, it was fixed by adding a width and height attribute to the pin
SVG.

layers/index.js

@@ -4,6 +4,7 @@ import Stamen from 'ol/source/Stamen.js';
 
 import amtrakLayer from './amtrak/layer.js';
 import arenasLayer from './nhl-arenas/layer.js';
+import menardsLayer from './menards/layer.js';
 
 const layerCategories = [
     {
@@ -56,6 +57,10 @@ const layerCategories = [
                 name: "NHL Arenas",
                 layer: arenasLayer,
             },
+            {
+                name: "Menards",
+                layer: menardsLayer,
+            },
         ]
     }
 ];