Finalized registration

[ColinLefter]

Summary of Changes

• Created a pages directory, added index.tsx, create-account.tsx, log-in.tsx and _app.tsx
• Refactored code
• Fixed missing onChange parameter in inputs on registration.tsx
• Created Login.tsx under /components
• Implemented a navbar via navbar.tsx under /components
• Added a ColorSchemeToggle to the navbar
• Added Tailwind CSS
• Tested form output in Login.tsx and Registration.tsx via an alert