Revert "Add subtitle without using additional packages"

This reverts commit 47fc1f17ed64c81e798f5cc8d4ded12aebab361c.

I don't think we should be fiddling with the layout of titles in the style.
We can leave that to the editors.

Additionally, as written this breaks pdflatex (at least the version
I am running). The \large has to be put in curly braces otherwise I
get

     pdfTeX error (ext4): \pdfendlink ended up in different nesting level than \pdfstartlink.
    \AtBegShi@Output ...ipout \box \AtBeginShipoutBox
                                                      \fi \fi
    l.387

    !  ==> Fatal error occurred, no output PDF file produced!