Set up: Email and google/github social login

[harshsinghatz]

Add next auth configs for setting those up

1. Add normal email flow
2. Add GitHub login
3. Add Google login

Implementation Details:

• Fill this after the task is done

Acceptance test:

• User should be able to login with all three accounts

[harshsinghatz]

For now only GitHub is done

Email and google social login are yet to be done!