**HUGE COMMIT WARNING**
**REQUIRES MIGRATION**
Here we are attempting to get to a clean(er) slate before significant push for digitization workflow functionality.
This means getting rid of all code relating to the following entities/features:

1. Shopping carts, shopping cart items, orders, etc. This will be replaced with UserItems and DigActions
1. Visits -- this is the old way of page tracking. Will be replaced with Google analytics (or similar).
1. Votes -- this feature is no longer needed.
1. Items -- the 'Item' model was for anything from the Solr index that was voted on. Since we are getting rid of Votes, we can get rid of Items.