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 https://github.com/LaunchAcademy/make_it_so/issues/66 https://github.com/LaunchAcademy/make_it_so/issues/70

• Ensure that babel config is up to date to run asyn/await https://github.com/LaunchAcademy/make_it_so/issues/73

• Update designated ruby version to 2.7.3 to ensure support on heroku https://github.com/LaunchAcademy/make_it_so/issues/81

[nwalberts]

WIP PR https://github.com/LaunchAcademy/make_it_so/pull/83

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