Enhancements & Refactor: Data Fetching, Types, API Routes, a11y, E2E

[asbhogal]

The following improvements will be made:

• Replacement of Context API with component-specific server-side data fetching
• Refactoring of types
• Resolve hydration error
• Update Next.js and other packages
• Integration of futher a11y and E2E testing
• Migration of data to MongoDB w/ Payload CMS