Update the Shapefile with a new political and administrative map of Nepal

Nepal government recently launched the new political and administrative map. It would be great to update the NepalMap with the new Shapefile as the work progress.

Download link: http://www.dos.gov.np/download/news-events/shapefilegis-data-for-political-and-administrative-map-of-nepal

Start by reviewing how NepalMap currently loads its political and administrative Shapefile, then retrieve the replacement data from the linked Nepal government download page. Done means the updated Nepal boundaries and administrative divisions are represented correctly in the map and existing map checks, if any, still pass.

Written by the indexing model from the issue text.