Add sidekiq gem
(green) Make test pass SignUpsController#index sets @sign_up
Make incremental progress on implementing sign up form
Add uuid to SignUp fabricator
Refactor tests for SignUp routes
(red) Write failing test => SignUpsController#update sets @sign_up
(green) Make test pass => SignUpsController#update sets @sign_up
(green) Write passing test => SignUpsController#update creates a SignUp
(red) Write failing test => SignUpsController#update updates a SignUp
(green) Make test pass test => SignUpsController#update updates a
SignUp