reworked home screen widgets to mirror the in-app timetable, hidden below android 12

android/app/src/main/AndroidManifest.xml

@@ -81,6 +81,7 @@
              the home_widget Flutter plugin resolves them as <app-package>.<name>. -->
         <receiver
             android:name="eu.mhsl.marianum.mobile.client.TimetableDayWidget"
+            android:enabled="@bool/widget_supported"
             android:label="@string/widget_day_label"
             android:exported="true">
             <intent-filter>
@@ -93,6 +94,7 @@
 
         <receiver
             android:name="eu.mhsl.marianum.mobile.client.TimetableWeekWidget"
+            android:enabled="@bool/widget_supported"
             android:label="@string/widget_week_label"
             android:exported="true">
             <intent-filter>