PDP Variant Layout UX update

[aaronjudd]

With inventory updates we'll not be automatically updating inventory qty for variants with children.

This leads to a UI refactor, but rather than just replacing the inventory logic, we should update the product detail page.

• [x] Move variant control/setting template into the admin side bar.
• [ ] Simple Product View - https://github.com/reactioncommerce/reaction/issues/500 with a "single variant / simple product view"
• [x] Variants (with children) with images.
• [ ] Variant / Option View dropdown selector, with images.

[spencern]

This is HUGE. So looking forward to this UI update, something we discussed adding internally a few times @getoutfitted but have held off on so far.

[aaronjudd]

I will shed a few tears to see my progress bars gone ;-)

[spencern]

We will all mourn the loss of the progress bars. :cry:

[aaronjudd]

Closing - insufficient details.