Add hyperlinks to bibliographics report

[nkmeyers]

Hyperlink the outputs of the search feature (e.g. https://library.distantreader.org/carrels/plague-from-freebo/htm/search.htm) so the results are hyperlinked back to their cached xml or plaintext content from their IDs or paths so that clicking the IDs would resolve to the plaintext or original or cached content.

related to #135