Handle unicode characters correctly in C locale

On the home page of the tissue website, a unicode em dash character is displayed incorrectly as ?????????. This happens because the website is built by the CI in a C locale, and tissue fails to correctly handle unicode characters in a C locale. This is however not a skribilo bug. skribilo handles unicode characters correctly regardless of the locale. This bug likely arises when tissue copies the output of skribilo and writes it to a file.

(made with skribilo)