Remove redundant fetch

Remove redundant fetch of collection data.  This was needed if
we were going to have multiple maps, but since we still have only
one, it's not needed.
Lower initial zoom level of map

Use an initial zoom level of 10 instead of 11 for the map so that
the entire city is visible in the viewport and so that it's clear
that the map also includes suburban areas.

Also add JavaScript to dynamically size the map container to the
full height of the viewport and to resize it when the window is
resized.

Fixes https://github.com/sc3/cook-convictions/issues/85