Dictionary show action for letters, alphabetical links helper

config/routes.rb

@@ -1,7 +1,7 @@
 Rails.application.routes.draw do
   devise_for :users
   #get 'dictionary/index'
-  resources :dictionary, only: [:index]
+  resources :dictionary, only: [:index, :show]
   resources :words, only: [:index, :show]
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html