Update presentation

wien_talks/wien_talks_flutter/lib/models/news_event_model.dart

@@ -1,34 +0,0 @@
-class NewsEventModel {
-  final String content;
-
-  final DateTime timestamp;
-
-  final double latitude;
-
-  final double longitude;
-
-  NewsEventModel({
-    required this.content,
-    required this.timestamp,
-    required this.latitude,
-    required this.longitude,
-  });
-
-// Convert NewsData to a Map
-  Map<String, dynamic> toJson() {
-    return {
-      'content': content,
-      'timestamp': timestamp.toIso8601String(),
-    };
-  }
-
-// Create NewsData from a Map
-  factory NewsEventModel.fromJson(Map<String, dynamic> json) {
-    return NewsEventModel(
-      content: json['content'] as String,
-      timestamp: DateTime.parse(json['timestamp'] as String),
-      latitude: json['latitude'] as double,
-      longitude: json['longitude'] as double,
-    );
-  }
-}