API [1/2]

[X] Drop flask-restful [2/2]
- [X] Implement marshmallow
- [X] Use flask’s MethodView
[ ] Basic documentation

Use sqlalchemy instead of peewee [0/2]

[ ] Convert models
[ ] Use sqlalchemy methods in every file

Admin page [0/2]

[ ] Show current trips
[ ] Limit usage based on role

Move files to a package [0/1]

[ ] Refactor