Add support for Django 4.0

Fixing edge case bug in setup.

Updated manifest file

Version bump

Fix next url when there is only one org

Support next GET value

Updating README

Running code through black

Updating README, adding license, adjusting setup, etc.

Updating README

back to python code highlight on README.md

updating installation section on README.md

adding basic documentation on README.md

show NLOTP_SETUP_EXCLUDED_URLS setting required error only if NLOTP_2FA_SETUP_REQUIRED is enabled.

adding ability to require 2FA setup.
moving urls and excluded urls list to settings.
single otp check middleware required.
updates on qr view.
clear device session key when disabling 2FA.

fixing typo on checks error code.

verify, OTP setup and qr views. related logic. basic templates.