- `user-groups`: Add warning for removing yourself.
- `restrict-wildcard-mentions`: Updated setting name to match UI.
- `format-your-message-with-markdown`: In-app help is now an icon.
- `web-public-streams`: Add link to Zulip's Rules of Use.
Adds content on user group permissions / management to the general
help center article for user groups (`/help/user-groups`) and
removes the then redundant `/help/restrict-user-group-management`
article.
Redirects links in help center and api documentation from deleted
article to the new configure user group settings section of
`/help/user-groups`.
Fixes#21383.
Oops, I have a couple of changes here:
1) Adding a "Create user groups" section to the new org guide.
2) Moving a tip out of how-to-invite-users-to-join.md, so that I
can reuse that section in the Zulip for clases guide I'm working
on without having the tip in it.