Move the Lat / Lng coordinates to the theme config files.

Description of the new functionality

The latitude / longitude coordinates used as the default map position are currently hard coded, we would like this to be configurable within the "theme.config.js" files in the Theme folders.

What we need to code

Currently this is hard coded on this line ( https://github.com/code-for-chapel-hill/NC-COVID-Support/blob/master/covid-19-support/src/App.vue#L108 ) as:

centroid: [35.91371, -79.057919]

These coordinates should be moved in each of the Theme.config.js files under a new section called settings. e.g.

theme = {
   settings: {
      initialMapCenter: {
         lat: 35.91371,
         lng: -79.057919
       }
   }
   ...
}

code-for-chapel-hill / NC-COVID-Support

Move the Lat / Lng coordinates to the theme config files. #191