feat: Implement authentication and database setup with UI improvements

[Alvalens]

Description

Introduce NextAuth for authentication, set up Prisma with a User model, and enhance the landing page and layout styles. Update references from GDSC to GDGoC and improve the footer logo.

Changes

1. Added user authentication logic to handle login with email and password.
2. Implemented session management to track authenticated users.
3. Integrated error handling for invalid credentials and login failures.
4. Updated Prisma schema and database models.
5. Fix and improve some admin panel ui

How Has This Been Tested?

Manual testing of the backend authentication process

• Tested successful login with valid credentials.
• Tested failed login attempts with incorrect credentials (invalid email/password).

Note: The frontend-related tests are pending resolution due to issues outside the scope of this PR.

[Copilot]

Copilot reviewed 8 out of 23 changed files in this pull request and generated 1 comment.

Files not reviewed (15)

• .env.example: Language not supported
• package.json: Language not supported
• prisma/migrations/20241230150056_init/migration.sql: Language not supported
• prisma/migrations/20250101092221_init/migration.sql: Language not supported
• prisma/schema.prisma: Language not supported
• app/_app.tsx: Evaluated as low risk
• app/_document.tsx: Evaluated as low risk
• app/admin/layout.tsx: Evaluated as low risk
• app/admin/dashboard/page.tsx: Evaluated as low risk
• app/auth/login/page.tsx: Evaluated as low risk
• prisma/migrations/migration_lock.toml: Evaluated as low risk
• app/layout.tsx: Evaluated as low risk
• app/providers/NextAuthProvider.tsx: Evaluated as low risk
• app/(user)/layout.tsx: Evaluated as low risk
• app/context/sessionContext.tsx: Evaluated as low risk

Comments suppressed due to low confidence (1)

lib/auth.ts:23

• [nitpick] The variable name 'user' could be more descriptive, such as 'fetchedUser', to indicate that it represents a user fetched from the database.

const user = await prisma.user.findUnique({