feat: new background work process

This removes all previous dependencies on RabbitMQ and the need to run separate cron and requeueing processes.

Gemfile

@@ -5,10 +5,8 @@ gem "authie"
 gem "autoprefixer-rails"
 gem "basic_ssl"
 gem "bcrypt"
-gem "bunny"
 gem "changey"
 gem "chronic"
-gem "clockwork"
 gem "dotenv-rails"
 gem "dynamic_form"
 gem "encrypto_signo"
@@ -55,4 +53,5 @@ group :development do
   gem "rubocop"
   gem "rubocop-rails"
   gem "timecop"
+  gem "webmock"
 end