Move ActiveJob config to initializer (#56)

Reviewed-on: #56

config/initializers/active_job.rb

@@ -0,0 +1,3 @@
+# Use a real queuing backend for Active Job (and separate queues per environment).
+Rails.application.config.active_job.queue_adapter = :solid_queue
+Rails.application.config.solid_queue.connects_to = { database: { writing: :queue } }