Fine tune the admin UI.

data/www/js/setup.js

@@ -0,0 +1,20 @@
+const ssid = document.getElementById('ssid');
+const wifiPass = document.getElementById('wifiPass');
+const admin = document.getElementById('admin');
+const adminPass = document.getElementById('adminPass');
+const out = document.getElementById('out');
+
+async function scan() {
+  const response = await fetch('/api/wifi/scan');
+  const json = await response.json();
+  ssid.innerHTML = json.networks.map(network => `<option>${network.ssid}</option>`).join('');
+}
+
+async function save() {
+  const body = {ssid: ssid.value, wifiPass: wifiPass.value, admin: admin.value, adminPass: adminPass.value};
+  const response = await fetch('/api/setup', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(body)});
+  out.textContent = await response.text();
+}
+
+document.getElementById('saveSetup').addEventListener('click', save);
+scan();