Fix manifest icon and version compatibility

CloudronManifest.json

@@ -16,7 +16,6 @@
   "manifestVersion": 2,
   "website": "https://docmost.com",
   "contactEmail": "support@docmost.com",
-  "icon": "logo.png",
   "tags": [
     "productivity",
     "collaboration",
@@ -26,7 +25,7 @@
   ],
   "postInstallMessage": "Docmost has been installed successfully!\n\nTo get started:\n1. Access your Docmost instance at https://%s\n2. Create your first workspace and admin account\n3. Start collaborating on documentation\n\nDefault features include:\n- Real-time collaborative editing\n- Diagram support (Draw.io, Excalidraw, Mermaid)\n- Page history and permissions\n- Multilingual support\n\nFor more information, visit: https://docmost.com/docs",
   "minBoxVersion": "7.0.0",
-  "maxBoxVersion": "8.0.0",
+  "maxBoxVersion": "9.0.0",
   "memoryLimit": 512000000,
   "optionalSso": true,
   "mediaLinks": [