added pwa + dienstreise support

package.json

@@ -21,6 +21,7 @@
     "@angular/platform-browser": "^18.0.0",
     "@angular/platform-browser-dynamic": "^18.0.0",
     "@angular/router": "^18.0.0",
+    "@angular/service-worker": "^18.0.0",
     "@capacitor/app": "6.0.1",
     "@capacitor/core": "6.1.2",
     "@capacitor/haptics": "6.0.1",
@@ -61,4 +62,4 @@
     "typescript": "~5.4.0"
   },
   "description": "An Ionic project"
-}
+}