help: Document "Inbox view" mobile feature.

- Adds a new page under the "Reading messages" section documenting
the Inbox view on mobile.
- Adds Inbox, expand more, and expand less SVG mobile icons.
- Cross-links with "Recent conversations" and "All messages".

help/all-messages.md

@@ -12,5 +12,6 @@
 ## Related articles
 * [Reading strategies](/help/reading-strategies)
 * [Recent conversations](/help/recent-conversations)
+* [Inbox](/help/inbox)
 * [Configure default view](/help/configure-default-view)
 * [Reading topics](/help/reading-topics)

help/inbox.md

@@ -0,0 +1,37 @@
+# Inbox
+
+The **Inbox** is the default view in the Zulip mobile app. It's a great way to
+get an overview of all the unmuted conversations where you have unread messages,
+excluding [inactive streams](/help/manage-inactive-streams).
+
+The **Inbox** view shows your unread direct message conversations, followed by
+all topics with unread messages, grouped by stream. The list of streams is
+sorted alphabetically, with [pinned streams](/help/pin-a-stream) at the top.
+
+{start_tabs}
+
+{tab|mobile}
+
+1. Tap the **Inbox**
+   (<img src="/static/images/help/mobile-inbox-icon.svg" alt="inbox" class="mobile-icon"/>)
+   tab in the bottom left corner of the app.
+
+{end_tabs}
+
+!!! tip ""
+
+    You can collapse or expand the list of topics in a stream by tapping the
+    **collapse**
+    (<img src="/static/images/help/mobile-expand-less-icon.svg" alt="inbox" class="mobile-icon"/>)
+    or **expand**
+    (<img src="/static/images/help/mobile-expand-more-icon.svg" alt="inbox" class="mobile-icon"/>)
+    icon to the left of a stream name.
+
+## Related articles
+
+* [Reading strategies](/help/reading-strategies)
+* [Recent conversations](/help/recent-conversations)
+* [All messages](/help/all-messages)
+* [Mute or unmute a stream](/help/mute-a-stream)
+* [Mute or unmute a topic](/help/mute-a-topic)
+* [Browse and subscribe to streams](/help/browse-and-subscribe-to-streams)

help/include/sidebar_index.md

@@ -88,6 +88,7 @@
 * [Reading strategies](/help/reading-strategies)
 * [Recent conversations](/help/recent-conversations)
 * [All messages](/help/all-messages)
+* [Inbox](/help/inbox)
 * [Message actions](/help/message-actions)
 * [Marking messages as read](/help/marking-messages-as-read)
 * [Marking messages as unread](/help/marking-messages-as-unread)

help/recent-conversations.md

@@ -12,4 +12,5 @@
 * [Reading topics](/help/reading-topics)
 * [Reading strategies](/help/reading-strategies)
 * [All messages](/help/all-messages)
+* [Inbox](/help/inbox)
 * [Configure default view](/help/configure-default-view)