Feature/shopper login

[OliviaJSmith]

Description

Describe your changes here.

Fixes #Issue_Number (if available)

Ensure that your pull request has followed all the steps below:

• [ ] Code compilation
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing
• [ ] Extended the README / documentation, if necessary

[meghanmae]

The register button won't work, a migration needs to be ran. But working otherwise.