Issues with the user authentication

[jarifibrahim]

The following issues need to be resolved in order to have a smooth user authentication workflow

• Update the user signup and login page. The current pages serve the purpose but there would be a significant improvement if we use any of the freely available templates.
• Update the usage of allauth Django app. The allauth app emits signals on user authentication events. I couldn't find any signal handlers for these signals. This is the main reason for authentication errors. Incorrect use of allauth django app #203
• Use environment variable to store SMTP credentials. Use environment variables to store SMTP credentials. #204
• Add tests for the entire authentication workflow.