Digest Theme does not appear to route to archives page correctly

[scottfines]

Steps to Reproduce

1. navigate to digest.ghost.io
2. click "PREVIOUS ISSUE" to navigate to previous post
3. click "BROWSE ALL ISSUES"
4. Note the 404 not found

It appears that the route just doesn't exist, but I'm not sure if that's because the theme itself has an error, or if the documentation just needs to include an additional step to get it to work.

Note: I am using digest.ghost.io as an example because I thought it might be easier to debug, but I am also seeing this on my own blog using the digest theme.