Fix: Clerk authentication setup and configuration

[tanmayjoddar]

• Move ClerkProvider to root layout for proper app-wide authentication
• Create .env.local with Clerk environment variables template
• Fix sign-in page by removing duplicate ClerkProvider
• Add sign-up page with proper Clerk components
• Update package-lock.json with latest dependencies

This resolves the 'Missing publishableKey' error in both development and production environments.

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[Aritra203]

This pull request integrates the Clerk authentication library into the application, refactors the sign-in page, and introduces a new sign-up page. Below are the most important changes grouped by theme:

Integration of Clerk authentication:

• app/layout.tsx: Added ClerkProvider to wrap the application, enabling Clerk's authentication context globally. ([[1]](https://github.com/coding-junction/Coding_Junction2.0/pull/6/files#diff-eca96d2c09f31517696a26e1d0be4070e1fbab02831481bed006e275741d030bR3), [[2]](https://github.com/coding-junction/Coding_Junction2.0/pull/6/files#diff-eca96d2c09f31517696a26e1d0be4070e1fbab02831481bed006e275741d030bR27-R35))

Refactoring of the sign-in page:

• app/sign-in/page.tsx: Removed the ClerkProvider wrapper (now handled globally in RootLayout), renamed the component to SignInPage, and cleaned up unused code. ([app/sign-in/page.tsxL2-R16](https://github.com/coding-junction/Coding_Junction2.0/pull/6/files#diff-f8c17ab59b605a324a8e0f93af18c0dfd012f1d18ddadb7335e9a1f852caa492L2-R16))

Addition of the sign-up page:

• app/sign-up/page.tsx: Introduced a new SignUpPage component using Clerk's SignUp component for user registration, with conditional rendering for signed-in and signed-out states. ([app/sign-up/page.tsxR1-R18](https://github.com/coding-junction/Coding_Junction2.0/pull/6/files#diff-d086796fd009d64f6d786d4ec0a698f356cb2b4f7385a83c9135d9b40070955fR1-R18))