feat(show parties): prepare to use ticket cart components

config/routes.rb

@@ -18,6 +18,7 @@ Rails.application.routes.draw do
   # Parties
   get "parties",            to: "parties#index",  as: "parties"
   get "parties/:slug.:id",  to: "parties#show",   as: "party"
+  post "parties/:slug.:id/checkout", to: "parties#checkout", as: "party_checkout"
 
   # Routes for devise authentication Gem
   # Bind devise to user