Add global product component

[Heydon]

Karin Gruman is leading the design of Journal, Book, Article, and Series objects. FJ notes while these are for springer first, they will be applicable to sn.com and beyond.

In Elements terms, these culminate in what I think should be a global-product component, incorporating multiple templates for different variants and list views.

• Create basic product template
• Solve layout with global-layout components
• Add additional variants and modes
• Add list view (for loop with partial)
• Review with Karin
• Document

[amyhupe]

Blocked while we wait for input from Karin

[sturobson]

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