related: fdo#73682 Introduce HTML detection service

Change-Id: I66bb579019ce8411b821c623955a454fd81cf811
Reviewed-on: https://gerrit.libreoffice.org/7600
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>