the entire './public' folder that Hugo produces is embedded into a
variable of 'embed.FS' type and served directly using the default http
mux that Go std offers.
ci, pre-commit, Dockerfile and compose file have all been updated
nginx is no longer needed to front the site files, which enabled
switching to a SCRATCH image containing just a single statically linked
"homepage" app that has all files (html, css, js) embedded.
the containers are otherwise empty (as the name SCRATCH suggests), which
further decreases potential attack surface area.