Renders flash notices.
<.flash kind={:info} flash={@flash} /> <.flash kind={:info} phx-mounted={show("#flash")}>Welcome Back!</.flash>
<.flash hidden id="flash-single-info-no-title" kind={:info}> Info message </.flash>
<.flash hidden id="flash-single-error-with-title" title="Flash title" kind={:error}> Error message </.flash>
<.flash hidden id="flash-single-no-close-button" kind={:info}> Info message </.flash>