Revamp the Mapbox implementation

[peterblazejewicz]

• add @types declaration for Mapbox
• redo the TS to default imports
• redo the Mapbox initialization
• add destroy routine

This commit make the actual map to show on the page. In order to view the map one needs to use updated token from Mapbox and correct stylesheet ref when creating map instance.

Thanks!

[simonaco]

Awesome work Peter, thank you!