Change directory structure.

[adriaanwm]

Currently the app structure is layered (view layer, model layer, etc.)
The issue with this is that if we want to add some specific functionality (like Forgot Password) we need to jump around the codebase a lot. Instead I think something like this would be easier to manage in terms of adding/removing functionality.

@geekforbrains @staydecent

libs/
    forgot_password/
        model.py
        views.py
        __init__.py
        ...