help-beta: Seperate heading/description and ordered list into 2 files.

For included files, our conversion tool needs a file just to be an
ordered list to properly surround it with FlattenList. If there is
heading and description in the file, the conversion script will not
insert FlattenList. So, we just create two different include files in
this case, first for the heading/description and second for the ordered
list.

help/import-from-mattermost.md

@@ -178,7 +178,9 @@ Replace `<username>` and `<server_ip>` with the appropriate values below.
 
 {tab|self-hosting}
 
-{!import-into-a-self-hosted-zulip-server.md!}
+{!import-into-a-self-hosted-server-description.md!}
+
+{!import-into-a-self-hosted-server-instructions.md!}
 
 1. To import into an organization hosted on the root domain
    (`EXTERNAL_HOST`) of the Zulip installation, run the following commands,
@@ -214,7 +216,9 @@ Replace `<username>` and `<server_ip>` with the appropriate values below.
 
 {tab|mm-self-hosting-cloud-export}
 
-{!import-into-a-self-hosted-zulip-server.md!}
+{!import-into-a-self-hosted-server-description.md!}
+
+{!import-into-a-self-hosted-server-instructions.md!}
 
 1. To import into an organization hosted on the root domain
    (`EXTERNAL_HOST`) of the Zulip installation, run the following commands,

help/import-from-rocketchat.md

@@ -64,7 +64,9 @@ be your **exported data** file in the instructions below.
 
 {tab|self-hosting}
 
-{!import-into-a-self-hosted-zulip-server.md!}
+{!import-into-a-self-hosted-server-description.md!}
+
+{!import-into-a-self-hosted-server-instructions.md!}
 
 1. To import into an organization hosted on the root domain
    (`EXTERNAL_HOST`) of the Zulip installation, run the following

help/import-from-slack.md

@@ -105,7 +105,9 @@ in order to export direct message data.
 
 {tab|self-hosting}
 
-{!import-into-a-self-hosted-zulip-server.md!}
+{!import-into-a-self-hosted-server-description.md!}
+
+{!import-into-a-self-hosted-server-instructions.md!}
 
 1. To import into an organization hosted on the root domain
    (`EXTERNAL_HOST`) of the Zulip installation, run the following

help/include/import-into-a-self-hosted-server-description.md

@@ -0,0 +1,6 @@
+#### Import into a self-hosted Zulip server
+
+Zulip's import tools are robust, and have been used to import workspaces
+with 10,000 members and millions of messages. If you're planning on doing
+an import much larger than that, or run into performance issues when
+importing, [contact us](/help/contact-support) for help.

help/include/import-into-a-self-hosted-server-instructions.md

@@ -1,10 +1,3 @@
-#### Import into a self-hosted Zulip server
-
-Zulip's import tools are robust, and have been used to import workspaces
-with 10,000 members and millions of messages. If you're planning on doing
-an import much larger than that, or run into performance issues when
-importing, [contact us](/help/contact-support) for help.
-
 1. Follow steps
    [1](https://zulip.readthedocs.io/en/stable/production/install.html#step-1-download-the-latest-release)
    and