Installation documentation

[Krzysztof Jeziorny]

The installation instructions for binding the URLs seem to be false, the migration can't find Oscar API this way:

ModuleNotFoundError: No module named 'oscarapi.app'

The info given in the project's Readme, including the URLs with path("api/", include("oscarapi.urls")), is working correctly.

Debian 10, Django 2.2, Python 3.7.3, Gunicorn 3+nginx

[Martijn Jacobs]

@TravellerSam You are right. In the README it was already updated a while ago, I just forgot it to do it in outofthebox.rst as well.

Fixed in 8ac23a0