Chore: Migrated Frontend Project From React + Vite to Next.js

[OWK50GA]

Changes Made:

• Installed Next 15.1.6 and React 19.00
• Uninstalled React Router DOM to do routing the Next way, and changed places where components and hooks were imported from React Router DOM to use Next
• Moved the assets folder into the public folder, and changed all the imports
• Changed all the jsx img tags to the Next Image component
• Used Next folder structure to handle routing and page linking
• Removed the Vite + React related dependencies and dev dependencies, replacing them with the right ones for Next,js
• Deleted the App.jsx, App.css, main.jsx, index.css and index.html, while replacing with global.css and app/layout.jsx

This PR makes sure build is still successful

Closes #42

[Oshioke-Salaki]

Resolve merge conflicts