Instead of referring to users being added or removed from channels,
we now use subscribe or unsubscribed from channels.
Splits the article for adding and removing users from a channel
into separate articles: /help/subscribe-users-to-a-channel and
/help/unsubscribe-users-from-a-channel.
The URL redirects for the combined add/remove articles (for both
channel and stream terminology) go to the subscribe users to a
channel article.
We now use "zulip-icon zulip-icon-all-messages" for the direct
message feed icon in the left sidebar. Previously the icon used
was "fa fa-align-right".
Renames CSS rule that styles Zulip UI icons in the help center
so that it makes sense to use it regardless of whether we are
documenting a mobile or desktop/web feature.
- Documents the new contextually-aware button since the instructions
now differ depending on whether you're currently in a direct message
view or not.
- Simplifies the new topic instructions by combining the first two
tabs into a single web/desktop tab, with an optional step 2 to
change the destination stream.
Fixes#27159.
- Corrects documentation to reflect that typing notifications also
work when narrowing to all direct messages in the web/desktop app,
and disappear under certain conditions.
