Add data validation for checkout/return dates #147
Description
Date requirements:
- Checkout time must be 2 days after the current time
- Return time must be within 2 days of checkout time
- Return time must be after the checkout time
Material UI's datetime picker has built in data validation: https://mui.com/components/date-time-picker/. To display a helpful error message we pass props into the TextField: https://mui.com/components/text-fields/