added authentication

[Joelsp19]

closes #429

Added Authentication

• Pretty much the same implementation as the last PR
• Wrapped the ClerkProvider around the entire and use ProtectedRoute on Admin Pages
• If we access AdminPages, it should redirect to signin page
• Clerk resources such as { SignInPage, ProtectedRoute } are under the Clerk folder
• We might need to test how it works on deployment branch (cuz maybe we need to include an API key)

From my understanding its ok to expose the frontend URL:

After someone signs up they still need admin access

1. Login to Clerk through the Vera gmail account
2. Go to the dashboard and select the user
3. Go to public metadata and add:
   
4. Now we should be able to access admin pages

Examples of signin/signup

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