Add neighborhood and subregion mappings
Add neighborhood and subregion mappings

Add two new subkeys to regions.json:

- region_subregions: these regions should not have a gymraids_ channel,
  but should instead be superregions that consist of all neighborhoods
  and gymraids_ channels for the listed child regions

- region_neighborhoods: mapping of region to neighborhood name.
  Neighborhoods must contain a "-".

Professor-Redwood-Team/Professor-Redwood,Professor-Redwood-Team/Professor-Redwood