Deploy production URL

[bitmand]

Issue #20 was created fixing the production URL in the site list. I realised afterwards that the url is "used" in other places as well ( deployment ie. ).

Creating this ticket to go through the usage of production url.

( Also, not sure production URL should be defined in the utterson_config. It is already defined in Jekyll's own config )

[snake66]

I did look at this while I made the changes to the site list, but did not make any changes in the deployment section, that should work as before I think (I hope). I'm not sure it makes sense to relate the production url to the deployment url at all, as they may be different at least for some setups.
Anyways, I'll be happy to help if needed.