Fix broken link from event to organization
Bug #357 : move is_provider/is_customer field to first step
Bug #355 : remove SIRET field for customers
Bug #355 : remove economic tab for non providers
Bug #355 : mandatory logo for customer
Bug #355 : mandatory web for customers
Bug #355 : mandatory detailed description for customers
Bug #355 : mandatory tags for customers
Bug #355 : mandatory activities for customers
Bug #364 : improve organization.offers validation
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