Create a new tour node for buildings in Ghana

[sorcerix]

As part of theYear of Return Ghana exchange we are hoping to add a tour stop in Ghana!

To see how we are handling events with tour nodes look in components/TourBar/TourButton.tsx.
To see how we are handling descriptions for tour nodes see components/TourBar/index.tsx.
In addition, you will need to add new map data to our geo json file. We are working on finding reliable data for this, but in the meantime you should be able to copy existing data and update its latitude and longitude.