@piggo Jekyll (but I guess Hugo et al. too) + jekyll-feed plugin (I have it by default) + this: https://carlschwan.eu/2020/12/29/adding-comments-to-your-static-blog-with-mastodon/
Depending on what you mean under integration with Fediverse, it can be only to have comments from it on the static site (above) to activepub integration - more difficult, for that you'd need to do some programming, but the easiest I came up with is to use `toot` cli as a part of the CI pipeline when building your site.
@piggo And if you really crave that web editor, I guess WebIDE of guthub (not clue whether such a thing exists, but I guess it does), or WebIDE of gitlab (works well!) could serve you just about fine. No need for a specific system, you can hack this together from existing pieces out there.