Create a leaflet map with customized default settings.
Arguments
character vector containing HTML identifiers for
the left and right sidebars.
Details
The "Gray scale" and "Monochrome" basemaps use a CARTO API key,
supplied via the CARTO_API_KEY environmental variable (see ./.env.example).
If it is unset, these basemaps will still load, but will display an
"API key required" watermark.