Add method to nuke all user related content

Specifically, all users that are not a superuser

server/nuke_users.py

@@ -0,0 +1,13 @@
+from wagtail.admin.forms.account import User
+from assignments.models import Assignment
+from objectives.models import Objective
+from rooms.models import Comment
+
+
+def nuke_users():
+    # todo: make sure the user confirms this when called from a django command
+    Objective.objects.exclude(owner=None).delete()
+    Comment.objects.all().delete()
+    Assignment.objects.exclude(owner=None).exclude(owner__username="guru").delete()
+
+    User.objects.filter(is_superuser=False).delete()