construct links using the baseurl struct's "build" method.
fix: files in a subfolder can now link to sibling files without resulting in a dead link.
if you have a file foo/bar/my_file.org and it has a link of file:another_file.org, before - this be a dead link, now, we grab the parent directories of the file that the link is found in and reconstruct the link so that file:another_file.org becomes :foo/bar/another_link.html.
if you have a file
foo/bar/my_file.organd it has a link offile:another_file.org, before - this be a dead link, now, we grab the parent directories of the file that the link is found in and reconstruct the link so thatfile:another_file.orgbecomes :foo/bar/another_link.html.