Ruby upgrade and other refinements index

[nwalberts]

The following items should be addressed in the next series of updates:

• providing the urgent bug-fixes to allow the app to run in development and production
  Bug: require_tree is not defined. #66
  Include example.test.js #70

• Ensure that babel config is up to date to run asyn/await
  BUG/Async & Await syntax not usable with current webpack config #73

• Update designated ruby version to 2.7.3 to ensure support on heroku
  Cannot deploy to heroku: Update configured ruby version to 2.7.3 #81

[nwalberts]

WIP PR
#83

I think Ive got #73 and #81 , but the other two may be a bit beyond me to fix without some guidance