Log level tidy up for prod (and deprecation)

[Br3nda]

i moved prod from INFO to WARN log level to make it readable. I can now see this in the logs:

2021-01-03T20:05:48.772246+00:00 app[web.1]: DEPRECATION WARNING: Including LoggerSilence is deprecated and will be removed in Rails 6.1. Please use ActiveSupport::LoggerSilence instead (called from <top (required)> at /app/config/application.rb:10)

Let's look at using LogRage gem instead, and then set back to INFO level