app/views/shared/header/_notifications.html.erb
<%= link_to_modal icon('bell'), notifications_path, remote: true, html: {id: 'notifications-modal'} %>
<div class="notifications-count"><%= current_user.unread_notifications_count %></div>
<div id="notifications-manager" data-components="notifications" data-notifications-options='{"url":"<%= read_notifications_path %>","userId":<%= current_user.id %>}'></div>