Fix content area popout windows and breadcrumbs menu

[PeeterPaal]

When a content area popout overlaps an unpopulated content area, bottom options are not clicable (see video)

breadcrumbs-menu-sd component needs some improvements:

• Show correct page as current page.
• When the store mount point is not front page (root), then do not show site root it in breadcrumbs menu.

When product uses variants and variant prices are different, then the price should be shown on the buy button when a variant is selected.

Auto-gen product page title alignment should be editable through design editor.