Fix manifest logo locations

assets/manifest.json

@@ -4,12 +4,12 @@
   "start_url": "./dbp-signature.html",
   "icons": [
     {
-      "src": "local/dbp-signature/icon-192.png",
+      "src": "local/@dbp-topics/signature/icon-192.png",
       "type": "image/png",
       "sizes": "192x192"
     },
     {
-      "src": "local/dbp-signature/icon-512.png",
+      "src": "local/@dbp-topics/signature/icon-512.png",
       "type": "image/png",
       "sizes": "512x512"
     }