<!DOCTYPE html>
<html lang="<%= @page.language_code %>">
<head>
  <%= render "alchemy/pages/meta_data" %>
  <%= stylesheet_link_tag 'application', media: 'all' %>
  <%= javascript_include_tag 'application' %>
  <%= csrf_meta_tags %>
</head>
<body>
  <%= yield %>
  <%= render "alchemy/edit_mode" %>
</body>
</html>

<!DOCTYPE html>
<html lang="<%= @page.language_code %>">
  <head>
    <%= render "alchemy/pages/meta_data" %>
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

    <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
  </head>

  <body>
    <%= yield %>
    <%= render "alchemy/edit_mode" %>
  </body>
</html>

Update the application layout installer template
Update the application layout installer template

It reflects what is default in Rails 6
