GraphiQL on root

Author: xuorig

config/routes.rb

@@ -1,6 +1,6 @@
 Rails.application.routes.draw do
   if Rails.env.development?
-    mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/graphql"
+    mount GraphiQL::Rails::Engine, at: "/", graphql_path: "/graphql"
   end
 
   post '/graphql', to: 'graphql#execute'