Update Dependencies and Make Generic for Any City

[samc1213]

This PR updates to the latest versions of dependencies, and makes this project usable for cities besides Chicago

• Upgrade to node version 18.17.1
• Remove dependencies on Mapbox and Google Maps. Use OpenStreetMap APIs
• Remove email signup and ward functionality
  • Email signup depended on mailchimp
  • Ward functionality is Chicago-specific
• Add Docker image, docker compose for "production", and docker compose for development
• Move all city-specific language to the config folder
• Update README to explain how to update for a new city, and how to use the docker compose files for deployment/development

See #182