improve page-create, service-worker and manifest

manifest.json

@@ -1,11 +1,11 @@
 {
-  "name": "dgray - Kleinanzeigen",
+  "name": "dgray.io - Marktplatz",
   "short_name": "dgray",
-  "description": "Deine lokale Kleinanzeigen-Plattform zum Tauschen und Handeln",
+  "description": "Anonymer Marktplatz mit Monero-Bezahlung",
   "start_url": "/",
   "display": "standalone",
-  "background_color": "#ffffff",
-  "theme_color": "#2563eb",
+  "background_color": "#F8F7F5",
+  "theme_color": "#6B7B8C",
   "orientation": "portrait-primary",
   "scope": "/",
   "lang": "de",