Clicking a category on a store page should change the URL

[morebrownies]

Currently it's not possible to deep link to a category within a store. This hurts us on SEO and doesn't make it possible to share a specific category on social platforms.

When a category is clicked, such as Office, the url should change to something like https://openbazaar.com/store/[guid]/office (we'll need to make sure these URLs don't mess up the listing detail url)