Fix Django sites with manage.py symlinks or similar unconventional configurations

There is an issue where `manage.py` can not be detect as a symlink because `find -f` doesn't find it.

Some Django projects also don't use manage.py, as `createproject` can take different templates for starting projects. Some people (myself included) create Django projects from scratch.

In order to support this, would it be considered if I wanted to implement a way to provide a custom Django management command via environment variables?