A request for this was made at DConf (I think by Nicholas) and we're already
doing it:
https://www.digitalmars.com/NewsGroup.html
Just click on the items under the "Archive" column. It's all there, back to the
first post. It's organized as one page per thread.
The web pages are created by this rather hackish and wretched program:
https://github.com/DigitalMars/ngArchiver
I run it manually whenever I think of it, which is erratically, because I've
tried repeatedly to set up a cron job to do it, but somehow it never runs. Bah.