Migrate to Goldmark

[tdemin]

gomarkdown, a fork of Blackfriday, is a large source of weird behavior (#33, #6, footnotes-oneliners, etc, etc), and can possibly lead to gmnhg flavor of Markdown being incompatible with current Hugo's defaults in unexpected ways.

As Hugo migrated to yuin's Goldmark since v0.60, there's little reason to stay with gomarkdown.