Enhance Sign-up and Login Components

[teckno]

• Description: The sign-up and login components need to be implemented and styled properly.
  

• Tasks:
  

• Create a sign-up form with input fields for username, email, and password.
• Implement form validation for the sign-up form.
• Create a login form with input fields for username/email and password.
• Implement form validation for the login form.
• Style the forms to match the overall design of the landing page.