create Item card feature include

[evanwill]

Add an Item card(s) to page (similar to Browse cards) given an list of objectid(s).
{% include feature/item-card.html objectid="demo_001" %}

Possible additions:

• rather than a list of objectids, provide a value is a specific field to filter on.
• item gallery option, rather than cards, creates a spotlight gallery set up (or is this a separate include? create it too!)