user docs: Add instructions for setting up user groups.

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.

templates/zerver/help/create-user-groups.md

@@ -0,0 +1,15 @@
+# Create user groups
+
+User groups allow you to [mention](/help/mention-a-user-or-group) multiple
+users at once, [notifying](/help/pm-mention-alert-notifications) them about a message. For example, you may choose to create user groups for teams in your organization.
+
+## How to create a user group
+
+{!how-to-create-a-user-group.md!}
+
+## Related articles
+
+* [Setting up your organization](/help/getting-your-organization-started-with-zulip)
+* [User groups](/help/user-groups)
+* [Invite users to join](/help/invite-users-to-join)
+* [Getting started with Zulip](/help/getting-started-with-zulip)

templates/zerver/help/getting-your-organization-started-with-zulip.md

@@ -99,6 +99,18 @@ stream](/help/create-a-stream#stream-options).
 
 {!how-to-invite-users-to-join.md!}
 
+!!! tip ""
+    You can link to your Zulip organization with a [nice badge](/help/linking-to-zulip).
+
+## Create user groups
+
+User groups allow you to [mention](/help/mention-a-user-or-group) multiple
+users at once, [notifying](/help/pm-mention-alert-notifications) them about a message. For example, you may choose to create user groups for teams in your organization.
+
+### How to create a user group
+
+{!how-to-create-a-user-group.md!}
+
 ## Set up integrations
 
 {!set-up-integrations.md!}

templates/zerver/help/include/how-to-create-a-user-group.md

@@ -0,0 +1,12 @@
+{start_tabs}
+
+{settings_tab|user-groups-admin}
+
+1. Under **Add a new user group**, enter a **Name** and **Description**.
+
+1. Click **Save**.
+
+1. Find the group in the list below, and add members. Zulip will notify
+   everyone who is added.
+
+{end_tabs}

templates/zerver/help/include/how-to-invite-users-to-join.md

@@ -21,7 +21,4 @@
 
 {end_tabs}
 
-!!! tip ""
-    You can link to your Zulip organization with a [nice badge](/help/linking-to-zulip).
-
 [allow-anyone-to-join]: /help/allow-anyone-to-join-without-an-invitation

templates/zerver/help/include/sidebar_index.md

@@ -27,6 +27,7 @@
 * [Create streams](/help/create-streams)
 * [Customize settings for new users](/help/customize-settings-for-new-users)
 * [Invite users to join](/help/invite-users-to-join)
+* [Create user groups](/help/create-user-groups)
 * [Set up integrations](/help/set-up-integrations)
 
 ## Account basics

templates/zerver/help/invite-users-to-join.md

@@ -10,6 +10,9 @@
 
 {!how-to-invite-users-to-join.md!}
 
+!!! tip ""
+    You can link to your Zulip organization with a [nice badge](/help/linking-to-zulip).
+
 ## Related articles
 
 * [Setting up your organization](/help/getting-your-organization-started-with-zulip)

templates/zerver/help/user-groups.md

@@ -12,18 +12,7 @@ trying to send a group of people a message, you'll want to either
 
 ### Create a user group
 
-{start_tabs}
-
-{settings_tab|user-groups-admin}
-
-1. Under **Add a new user group**, enter a **Name** and **Description**.
-
-1. Click **Save**.
-
-1. Find the group in the list below, and add members. Zulip will notify
-   everyone who is added.
-
-{end_tabs}
+{!how-to-create-a-user-group.md!}
 
 ### Modify a user group
 
@@ -46,3 +35,4 @@ any user group they are a part of. Guests cannot modify user groups.
 ## Related articles
 
 * [Restrict user group management](/help/restrict-user-group-management)
+* [Create user groups](/help/create-user-groups)