Revisit how we build location / on display list for facets

[jamieu]

I'm not sure the current method of periodically updating the index / building this list via npm run index-update isn't going to work long term. New locations are regularly added and their names updated and waiting for this command to be run manually will cause confusion / concern if those changes aren't reflected inline with the updated to other collection data.

[jamieu]

Can we add npm run index-update to the deploy process? or use Lamda?