refactor: relLangURL no longer required in paginator
refactor: relLangURL no longer required in paginator

Hugo's template just uses `.URL`:
https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/embedded/templates.autogen.go

See #915

gcushen/hugo-academic,gcushen/hugo-academic,gcushen/hugo-academic,gcushen/hugo-academic