[FE] Create login and sign up pages

[michaelhyi]

Description

• Frontend developers should follow the Figma designs to create the login and sign up pages using Next.js + Tailwind.

Acceptance Criteria

• Login and signup pages utilize the form HTML tags, with proper submission handling. For now, simply printing the form data will suffice.
• All states in the login / sign up flow (error or success) should be implemented and simulated with tests.
• Write basic form validation logic using Zod, and display error states based on the validation. Assume that if data validation passes (for now), the state will be success. This will change with the status from the backend.
• Routes: /login and /register. This is subject to change