DEPR: https://github.com/openedx/public-engineering/issues/224
The django-splash repo was created 11 years ago to let the LMS redirect
users to a splash screen when a user comes to the site for the first
time. It works by looking for a configurable cookie value and
redirecting from the middleware.
This feature was never documented, has some edx.org hardcoded defaults,
and is not compatible with MFEs.
BREAKING CHANGE: The django splash feature will no longer be available.