Demo popup: show on every dashboard visit, add upload notice (v2.2.4)

- Popup now shows every time user visits dashboard (not session-cached)
- Only shows on dashboard, not other pages
- Added upload disabled notice with amber highlight
- Upload listed as first full-version feature

server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "nomad-server",
-  "version": "2.2.3",
+  "version": "2.2.4",
   "main": "src/index.js",
   "scripts": {
     "start": "node --experimental-sqlite src/index.js",