reset initial zoom level and center map to view all of LA county

[emillipede]

AS A/AN: user

WHEN I: view the full extent of the map

I WANT TO:

• see tree information about cities across LA county (as a choropleth, for now)
• hover for more information
• click to zoom in and see more see detailed information + individual tree markers

as we expand coverage to other parts of LA county, we need to expand the extent of the the county visible when the map initially loads.

the visible map should include the full extent of the county - Matt Stiles collected data for cities as far east as Pomona, west to Malibu, north to San Fernando, south to Rancho Palos Verdes