We used to do that, but it turns out that having the Internet visit your chat community without any briefing isn't the best plan. Linking to the ReadTheDocs page has helped a lot in making sure people joining the community have some sense as to what to expect (e.g. that it's at times running a super beta version of Zulip, or that people are doing actual work, that we have a code of conduct, and you should send your test messages to #test here).