fdo#86440 move header and footer entry to insert menu

Change-Id: Id3c81d50e504e3d2e29f921955a10ef00c2d3646
Reviewed-on: https://gerrit.libreoffice.org/13028
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>