refactored code to work with simple popup when marker is clicked

lib/services/flood_station_provider.dart

@@ -1,10 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:async/async.dart';
-import 'package:flutter_map/flutter_map.dart';
-import 'package:latlong2/latlong.dart';
-
 import '../model/flood_station.dart';
-import '../widgets/custom_marker.dart';
 import 'api.dart';
 
 class FloodStationProvider extends ChangeNotifier {
@@ -16,17 +12,6 @@ class FloodStationProvider extends ChangeNotifier {
 
   List<FloodStation> get allStations => _allStations;
   List<FloodStation> get filteredStations => _filteredStations;
-  List<Marker> get stationsAsMarkers {
-    return allStations
-        .map<Marker>(
-          (e) => Marker(
-            alignment: Alignment.center,
-            point: LatLng(e.lat, e.long),
-            child: CustomMarker(),
-          ),
-        )
-        .toList();
-  }
 
   CancelableOperation? _filteredStationsFuture;