Added comments and refactored code

lib/pages/landing_page.dart

@@ -15,6 +15,7 @@ class LandingPage extends StatefulWidget {
   State<LandingPage> createState() => _LandingPageState();
 }
 
+// uses mixin OverlayService to show loading overlay
 class _LandingPageState extends State<LandingPage> with OverlayService {
   late FloodStationProvider floodStationProvider;
 
@@ -37,8 +38,10 @@ class _LandingPageState extends State<LandingPage> with OverlayService {
     );
   }
 
+  // if the list of all Stations is empty the method returns a button to load them
+  // else returns a list of FloodStations
   Widget _buildStationList() {
-    if (!_shouldShowList()) {
+    if (!_shouldShowList) {
       return Expanded(
         child: Center(
           child: ElevatedButton(
@@ -99,7 +102,9 @@ class _LandingPageState extends State<LandingPage> with OverlayService {
     Navigator.of(context).pushNamed(FloodStationPage.routeName);
   }
 
-  bool _shouldShowList() {
+  // returns boolean to decide whether the list of stations should be shown
+  // if the list of stations is empty and is not filtered either, the function returns false
+  bool get _shouldShowList {
     if (!floodStationProvider.filtered &&
         floodStationProvider.allStations.isNotEmpty) {
       return true;