Booko Upgrade to Rails 7 and Ruby 3.1.1

This was by far, the most complex Rails update for Booko. With Rails 6, I had migrated to webpack but with Rails 7 I was determined to go with the simpler ImportMaps method and it took some time to migrate.

While I was busy in Javascript land, I took the opportunity to remove as much JQuery as I could find and re-write it in regular JS or with StimulusJS controllers. Nice to get remove that dependency, as helpful as it was in the past.