Drinks and Bars each fetched + held their own copy of the drinks list. Adding
(or editing/archiving) a drink only updated Drinks's own copy — Bars's
BarDrinkEditor kept rendering the stale pre-change snapshot until a full page
reload re-mounted everything, so a newly added drink didn't show up in the
'add to bar' list without a manual refresh.
Lifted the drinks list + its reload fn into Dashboard, passed down as props to
both Drinks and Bars.
7fc4c1912c