Fix incorrect step numbers, ordering of guides, and missing categories.

1. We were showing the incorrect step numbers for prerequisite guides because
   we were relying on the orderby value in the step, instead of the total step
   count.
2. We were alphabetizing guides, now we ignore that because some customers
   require a specific order of categories.
3. We were missing categories because of an old param that we were tacking onto
   a request that was telling us to ignore categories with no guides on iPhone.