Add ARIA attributes to pagination
Add ARIA attributes to pagination

I opted for aria-label instead of aria-current on the current page span.
VO was not picking up aria-current.

Resources consulted:
https://www.a11ymatters.com/pattern/pagination/
https://a11y-style-guide.com/style-guide/section-navigation.html#kssref-navigation-pagination

Fixes https://www.pivotaltracker.com/story/show/169827401
(and related stories for other themes)

bigcartel/dugway,bigcartel/dugway,bigcartel/dugway