nest deployment files into subfolder of s3

[adambreznicky]

we've tried a few ways to nest the frontend app code into a subfolder of the data.tnris.org s3 bucket opposed to being the only files, loose, at the root of the bucket. seems like it's possible but the react router has issue with it since it doesn't have any paths registered which include the subfolder name.
let's try to implement this again but while incorporating/handling the subfolder name in the routes of react-router.