redirect on archived template

app/controllers/start_form_controller.rb

@@ -15,6 +15,8 @@ class StartFormController < ApplicationController
   end
 
   def update
+    return redirect_to start_form_path(@template.slug) if @template.archived_at?
+
     @submitter = Submitter.where(submission: @template.submissions.where(archived_at: nil))
                           .order(id: :desc)
                           .then { |rel| params[:resubmit].present? ? rel.where(completed_at: nil) : rel }