[XSLT] Render pub-id URLs as hyperlinks
[XSLT] Render pub-id URLs as hyperlinks

This is the recommendation from crossref. With this change,
we render pub-ids of pub-id-type doi as a hyperlink when they are
in URL format. Otherwise, we preserve the legacy format of
doi: [shoulder/id]

BirkbeckCTP/janeway,BirkbeckCTP/janeway,BirkbeckCTP/janeway,BirkbeckCTP/janeway