T2088
I looked into adding js linting directly into `arc lint.` However, the natively supported arcanist linters are not good choices for a react app. ESlint is the best choice, but this will require a different approach to integrate with `arc lint.`
As an interim step, ESlint can be integrated into the app dev scripts. This will allow linting to be performed with a one line command.
This diff does not fix any of the linting errors uncovered -- this will be handled all at once in a later diff. This diff only adds the required software to lint from command line.