url.py configuration. about cartridge HOT 1 CLOSED

Don't mind at all, but this belongs on the mailing list - if you have any other general questions, please post there!

As for your question, the docs have you covered. The shop categories are Mezzanine pages, have a read about how they work, and how their templates are loaded:

http://mezzanine.jupo.org/docs/content-architecture.html

As for using a Mezzanine page as the homepage (be it a Cartridge category or any other type of page), setting this up is covered in the FAQs:

http://mezzanine.jupo.org/docs/frequently-asked-questions.html#why-isn-t-the-homepage-a-page-object-i-can-edit-via-the-admin

from cartridge.