Productionize

This epic will contain items that need to be made into individual tickets

- [x] CICD -- #13
- [x] precommit hooks
- [x] black code formatter
- [x] flake8
- [x] coverage on website somewhere -- #18
- [ ] [`python manage.py check --deploy`](https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/#run-manage-py-check-deploy)
- [x] factory-boy for testing -- #32
- [ ] api versioning
- [ ] [HTTP Digest Authentication](https://www.twilio.com/docs/usage/security)
- [ ] `CONTRIBUTING.md`
- [ ] draw out user flow diagram for app interaction
- [ ] get a logo
- [x] django-debug-toolbar https://github.com/jazzband/django-debug-toolbar -- #38
- [ ] monitoring with prometheus and grafana
- [ ] load testing
- [ ] Jmeter
- [ ] locust

#### Miscellanous

- [ ] What other media types can we send to Twilio?
- [`content-types` Twilio accepts](https://www.twilio.com/docs/sms/accepted-mime-types)
- [ ] send a pdf
- [ ] send a voice memo
- [ ] send a contact
- [ ] send a ???