Flash experiments

• <%= link_to 'redirect with notice', flash_redirect_with_notice_path, class: :button %>
• <%= link_to 'redirect with alert', flash_redirect_with_alert_path, class: :button %>
• <%= link_to 'redirect with both', flash_redirect_with_both_path, class: :button %>
• <%= link_to 'from render', flash_from_render_path, class: :button %>
• <%= link_to 'from turbo', flash_from_turbo_path, class: :button, 'data-turbo-method': :post %>