help: Improve documentation for changing a status.

Expands web app instructions for setting a status to have
a tab for via user card and via personal menu.

Adds instructions for clearing a status via user card, via
personal menu, and for mobile.

Adds new svg file for the icon used in zulip/mobile for
clearing a status.

Fixes #29415.

Co-authored-by: Lauryn Menard <lauryn@zulip.com>

help/include/clear-status.md

@@ -0,0 +1,2 @@
+1. Click on the <i class="zulip-icon zulip-icon-x-circle"></i> to the
+   right of your current status.

help/include/self-user-card.md

@@ -1,4 +1,4 @@
 1. Hover over your name in the right sidebar.
 
 1. Click on the **ellipsis** (<i class="zulip-icon zulip-icon-more-vertical"></i>)
-   to open your **user card**.
+   to open your [**user card**](/help/user-cards).

help/include/set-status.md

@@ -0,0 +1,6 @@
+1. Click **Set status**.
+
+1. Click to select one of the common statuses, *or* choose any emoji and/or
+   write a short message.
+
+1. Click **Save**.

help/status-and-availability.md

@@ -21,22 +21,23 @@ You can set a status emoji, status message, or both.
 
 {start_tabs}
 
-{tab|desktop-web}
+{tab|via-user-card}
 
 {!self-user-card.md!}
 
-1. Click **Set a status**.
+{!set-status.md!}
 
-1. Click to select one of the common statuses, *or* choose any emoji and/or
+{tab|via-personal-settings}
-   write a short message.
 
-1. Click **Save**.
+{!personal-menu.md!}
+
+{!set-status.md!}
 
 {tab|mobile}
 
 {!mobile-profile-menu.md!}
 
-1. Tap **Set a status**.
+1. Tap **Set your status**.
 
 1. Tap to select one of the common statuses, *or* choose any emoji and/or
    write a short message.
@@ -45,6 +46,36 @@ You can set a status emoji, status message, or both.
 
 {end_tabs}
 
+### Clear a status
+
+{start_tabs}
+
+{tab|via-user-card}
+
+{!self-user-card.md!}
+
+{!clear-status.md!}
+
+{tab|via-personal-settings}
+
+{!personal-menu.md!}
+
+{!clear-status.md!}
+
+{tab|mobile}
+
+{!mobile-profile-menu.md!}
+
+1. Tap **Set your status**.
+
+1. Tap the **x**
+   (<img src="/static/images/help/mobile-x-icon.svg" alt="x" class="help-center-icon"/>)
+   to the right of your current status.
+
+1. Tap **Save**.
+
+{end_tabs}
+
 ### View a status
 
 Status emoji are shown next to a user's name in the sidebars, message feed,