細部の修正

backend/config/routes.rb

@@ -13,6 +13,7 @@ Rails.application.routes.draw do
   get 'wiki/changes', to: 'wiki_pages#changes'
   get 'wiki/:id/diff', to: 'wiki_pages#diff'
   get 'wiki/:id', to: 'wiki_pages#show'
+  get 'wiki', to: 'wiki_pages#index'
   post 'wiki', to: 'wiki_pages#create'
   put 'wiki/:id', to: 'wiki_pages#update'
   post 'users/code/renew', to: 'users#renew'