Updated urls.py and views.py of all three apps.

widget_appappandaway/announcementboard/urls.py

+from django.shortcuts import render
+from django.urls import path
+from .views import index
+
+# Create your views here.
+urlpatterns = [
+    path('', index, name='index'),
+]
+
+app_name = "announcementboard"
\ No newline at end of file

widget_appappandaway/announcementboard/views.py

 from django.shortcuts import render
+from django.http import HttpResponse
 
 # Create your views here.
+
+def index(request):
+    return HttpResponse('Announcement Board app.')

widget_appappandaway/forum/urls.py

+from django.shortcuts import render
+from django.urls import path
+from .views import index
+
+# Create your views here.
+urlpatterns = [
+    path('', index, name='index'),
+]
+
+app_name = "forum"
\ No newline at end of file

widget_appappandaway/forum/views.py

 from django.shortcuts import render
+from django.http import HttpResponse
 
 # Create your views here.
+
+def index(request):
+    return HttpResponse('Forum app.')