feat: cloud sync playground (#662)

* feat: add workspace playground page
* feat: add all demands to playground

Co-authored-by: tzhangchi <terry.zhangchi@outlook.com>

packages/app/public/manifest.json

@@ -0,0 +1,17 @@
+{
+  "name": "AFFiNE",
+  "short_name": "AFFiNE",
+  "icons": [
+    {
+      "src": "/chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "start_url": "/",
+  "display": "standalone",
+  "orientation": "portrait"
+}