Redesign the login forms

[StevenWeathers]

Description

This PR redesigns the login and registration forms, along with updating the standard text input field across the application to match the new form designs.

The registration page's two forms are now one with a checkbox to toggle between creating a guest user and a full account, simplifying the user experience.

What type of PR is this? (check all applicable)

• [x] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [x] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

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