made a little progress on grids demo

i mostly have my head wrapped around the problem a lot more, and need to just
let my brain sit

priv/static/js/dist/grids-basic.js

@@ -59,7 +59,7 @@ async function grids_request(net_id, recipient, amount, payload) {
         'amount': amount,
         'payload': payload };
     let obj_text = JSON.stringify(obj, undefined, 4);
-    let url = '/grids-spend';
+    let url = '/grids-mkdd';
     let req_options = { method: 'POST',
         headers: { 'content-type': 'application/json' },
         body: obj_text };