Implement custom map style and initial view

[caseycesari]

Overview

Makes use of the style created by @alexelash, and matches the initial map view to that of the wireframes. Also makes the map not interactive (as designed) and adds the navigation control.

Connects #23

Demo

Wireframes:

Screenshot of app:

Notes

Follow-up: #25

Testing Instructions

• Visit the app and verify the map looks roughly like the map in the wireframes.
• Verify that the map is not interactive.

[caseycesari]

Thanks for the review.