Prefer passing context to map instead of extra var
Improve spacing and alphabetization of attributes

Legibility++
Clear storyItems on click to prevent confusion

If the response from Reddit is slow, the stories from the previous
headline can stick around a while and look like they are associated with
the new headline. Wipe them out ASAP.
Sort nav items by # of subscribers

This feature exists in the Montage example, add it for feature parity.