remove unused controller action

Author: pascalwengerter

spec/dummy/app/controllers/api_controller.rb

@@ -4,9 +4,4 @@ def data
     render json: ["some", "server", "data"]
   end
 
-  def single_endpoint
-    user = "user number #{params[:number]}"
-    render json: [user]
-  end
-
 end