Pattern Details: Remove restricted height or increase max-height

[shaunandrews]

Currently, the preview on the pattern detail page (i.e. https://wordpress.org/patterns/pattern/large-background-image-with-title-and-description/) has set height of 50vh, which for many patterns causes an additional scrollbar:

It would be better if we could display the entire pattern without needing to scroll within the overall page. Instead of a fixed height, maybe we can switch to a max-height with a much larger value like 200vh.

This might introduce some issues with the drag handles; With the current behavior the drag handles could render outside the viewport. To fix this, I think we'd have to add some logic to ensure the drag handles always appear inside the viewport.

[ryelle]

I think this would be fixed by switching to the component suggested in #380, but I'll leave this open too just to make sure.

[ryelle]

Closing this, after much discussion with the site refresh (#635 (comment) & #650), it's required that we have a fixed-height viewport for previews. #672 is open to potentially update this on smaller screens.