snap: Switch to deb packages of nodejs and python3-pygments
snap: Switch to deb packages of nodejs and python3-pygments

node/14/stable snap package is not available on ppc64el and s390x.

nodejs deb package currently at 10.19.0~dfsg-3ubuntu1
in Ubuntu 20.04 LTS (base: core20)

anthonyfok/hugo,anthonyfok/hugo,anthonyfok/hugo,gohugoio/hugo,gohugoio/hugo,gohugoio/hugo