Add form submissions pagination

Added pagy gem to enable pagination and added it's bulma template to the
form submissions page

app/controllers/application_controller.rb

@@ -1,5 +1,6 @@
 class ApplicationController < ActionController::Base
   helper_method :current_user, :logged_in?
+  include Pagy::Backend
 
   def require_login
     redirect_to login_url unless current_user.present?

app/controllers/forms_controller.rb

@@ -10,7 +10,7 @@ class FormsController < ApplicationController
 
   def show
     @form = current_user.forms.find_by!(token: params[:id])
-    @submissions = @form.submissions
+    @pagy, @submissions = pagy(@form.submissions, items: 25)
   end
 
   def index