Investigate `react/prop-types` eslint rule

[matteovivona]

Recently, a rule for react/prop-types was made a warning.

This issue is to investigate whether or not it is needed and to turn the rule off or to make it an error and fix the relevant code.

[matteovivona]

I added this annotation in the Modal.tsx

/* eslint react/prop-types: 0 */

@HospitalRun/core-contributor is that a rule we need? Otherwise, you can disable it globally with

  "rules": {
    "react/prop-types": 0
  }

[jackcmeyer]

For now, I have made this a warning.