better help and onboarding

frontend/lib/utils/get_first_page.dart

@@ -0,0 +1,27 @@
+import 'package:anyway/pages/current_trip.dart';
+import 'package:anyway/pages/onboarding.dart';
+import 'package:anyway/structs/trip.dart';
+import 'package:anyway/utils/load_trips.dart';
+import 'package:flutter/material.dart';
+
+Widget getFirstPage() {
+  Future<List<Trip>> trips = loadTrips();
+  // test if there are any active trips
+  // if there are, return the trip list
+  // if there are not, return the onboarding page
+  return FutureBuilder(
+    future: trips,
+    builder: (context, snapshot) {
+      if (snapshot.hasData) {
+        List<Trip> availableTrips = snapshot.data!;
+        if (availableTrips.isNotEmpty) {
+          return TripPage(trip: availableTrips[0]);
+        } else {
+          return OnboardingPage();
+        }
+      } else {
+        return CircularProgressIndicator();
+      }
+    }
+  );
+}

frontend/lib/utils/load_trips.dart

@@ -1,7 +1,4 @@
-import 'dart:collection';
-
 import 'package:anyway/structs/trip.dart';
-import 'package:anyway/structs/landmark.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 Future<List<Trip>> loadTrips() async {