feat(home/models.py): only allow CourseModulePages to be created under CoursePages

home/models.py

@@ -57,6 +57,7 @@ class CoursePage(Page):
         FieldPanel("body"),
         FieldPanel("allowed_groups", widget=CheckboxSelectMultiple),
     ]
+    subpage_types = ["home.CourseModulePage"]
 
 
 class CourseModulePage(Page):
@@ -78,6 +79,7 @@ class CourseModulePage(Page):
         return self.title
 
     content_panels = Page.content_panels + ["body"]
+    parent_page_types = ["home.CoursePage"]
 
 
 class EventPageTag(TaggedItemBase):