Update templates directory in Themes doc
Update templates directory in Themes doc

Themes directory structure has changed: https://github.com/Sylius/SyliusThemeBundle/blob/master/UPGRADE.md#upgrade-from-1x-to-20
diimpp/Sylius,101medialab/Sylius,antonioperic/Sylius,SyliusBot/Sylius,antonioperic/Sylius,Zales0123/Sylius,diimpp/Sylius,Arminek/Sylius,pamil/Sylius,Sylius/Sylius,Zales0123/Sylius,lchrusciel/Sylius,Zales0123/Sylius,101medialab/Sylius,SyliusBot/Sylius,Arminek/Sylius,pamil/Sylius,SyliusBot/Sylius,antonioperic/Sylius,lchrusciel/Sylius,loic425/Sylius,pamil/Sylius,Arminek/Sylius,101medialab/Sylius,Sylius/Sylius,lchrusciel/Sylius,loic425/Sylius,Sylius/Sylius,loic425/Sylius,diimpp/Sylius