#702 Delete unused code
#702 Delete unused code

- Delete unused database tables

elimu-ai/webapp,elimu-ai/webapp,elimu-ai/webapp,literacyapp-org/literacyapp-web,literacyapp-org/literacyapp-web,literacyapp-org/literacyapp-web,elimu-ai/webapp,literacyapp-org/literacyapp-web