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. https://github.com/OpenSourceHelpCommunity/OpenSourceHelpCommunity.github.io/issues/203
• [ ] Use environment variable to store SMTP credentials. https://github.com/OpenSourceHelpCommunity/OpenSourceHelpCommunity.github.io/issues/204
• [ ] Add tests for the entire authentication workflow.