feat: 不要ソースの削除（#214） (#216)

#214

#214

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #216

backend/app/controllers/posts_controller.rb

@@ -141,10 +141,6 @@ class PostsController < ApplicationController
     end
   end
 
-  # DELETE /posts/1
-  def destroy
-  end
-
   def changes
     id = params[:id]
     page = (params[:page].presence || 1).to_i