Adds SHARE regionalisation files, renames existing files

shakyground2/regionalization.py

shakyground2/regionalization_files/eshm20.geojson

shakyground2/regionalization_files/eshm20.json

shakyground2/regionalization_files/germany.geojson

shakyground2/regionalization_files/germany.json

shakyground2/regionalization_files/global_stable.geojson

shakyground2/regionalization_files/global_stable.json

shakyground2/regionalization_files/global_volcanic.geojson

shakyground2/regionalization_files/global_volcanic.json

shakyground2/regionalization_files/share.geojson

shakyground2/regionalization_files/share.json