237 style data points

[TangoYankee]

Checklist

• [x] Add description
• [x] Reference the open issue that the pull request addresses
• [x] Pass code quality checks
  • spin up docker docker-compose up -d --build
  • enter api container docker-compose exec api /bin/bash
  • run api tests make validate
  • exit container ctrl/command+D or exit
  • enter web container docker-compose exec web /bin/sh
  • run front-end tests npm run test or npx jest
  • lint npm run lint-fix
  • exit container as above
• [x] Request code review
  • Please allow 36 hours from opening a pull request before merging a pull request- even if it has already received an approving review.
• [ ] Address comments on code and resolve requested changes
• [ ] Merge own code

Description

Achieves the first two acceptance criteria stated in issue. Third acceptance criteria will be achieved in a follow up issue: 1) When two readings are taken at the same location, they higher value is displayed 2) Formats the pollutant readings as geojson, for mapping 3) Replaces the mapbox markers with a data layer, to improve performance and be more semantic with the data display 4) Configures the data layer to color the points in line with EPA severity categories Issue: #237

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