As a user, I should not be able to login when I already have an active session

[TangoYankee]

Describe the bug
Users can technically access the auth/login path when already logged in. This will replace their current credentials with new ones. These means the previous credentials will be lost and the associated session cannot be logged out.

To Reproduce
Steps to reproduce the behavior:

1. Go to ''/auth/login" path when already logged in
2. Go through the sign in process

Expected behavior
Going to the log screen when already logged in will redirect to another page, such as the about page.

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Affected Components (For Developers)
Login component

Technical Resources (For Developers)
Should be able to access authToken context, and redirect when there is already a token present