[feat] implented confirm password

[rachaelch3n]

What's new in this PR 🧑‍🌾

Description

• Separated the auth flow into two pages: /login and /signup.
• Added a "confirm password" input on the signup page that displays an error if the password and confirm password inputs do not match.
• Implemented the ability to show or hide password inputs for both "password" and "confirm password" fields.
• Incorporated checks for password complexity (at least 8 characters, at least one number, and at least one lowercase character).
• Disabled the signup button until there are no errors (password and confirm password match, and complexity checks are met).

Screenshots

No checks passed

Some checks passed

Complexity checks passed but passwords don't match

All checks passed and signup button is enabled

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How to review

• Review the PasswordComplexity and PasswordInput implementation in utils
• Test the login flow in login page.tsx and ensure signIn work as expected
• Test the login flow in signup page.tsx and ensure signUp work as expected

Next steps

• styling

Relevant links

Online sources

Related PRs

CC: @ccatherinetan