The main question for me is comments. I don't want to use something like Disqus, and to require something like Discourse would cancel the whole point of having a static site generator that I can host on Github Pages or Gitlab pages. Ideally, what I would like to do is to have an hackernews post automatically generated for each post, and to redirect people to the HN post if they want to comment, but I am not sure that…
That would be absolutely awful. Imagine if every site did that. Would this be a site you would want to visit? Maybe what you want to do is have a link that sends you to the HN submission page with the fields pre-populated. That wouldn't be so bad.
Redirecting them to the HN pit of cynicism and leave-no-stone-left-unturnedism sounds awful. :)