[det]reply_htmx(+HTML)
[det]reply_htmx(+HTML,
+Request)Reply a plain HTML element as opposed to a complete HTML
page as created using reply_html_page/2,3.
While reply_htmx/1 is to be
used in a normal HTTP handler (route), reply_htmx/2
may be registered directly in the http_handler/3
declaration to deal with simple cases where we do not need the Request
data.