help: Add docs for new organization permission settings.

templates/zerver/help/allow-image-link-previews.md

@@ -0,0 +1,15 @@
+# Allow image/link previews
+
+{!admin-only.md!}
+
+By default, when a user uploads or links to an image or links to a website, a
+preview of the content will be showed. You can choose to disable previews of
+images and links separately.
+
+{!go-to-the.md!} [Organization permissions](/#organization/organization-permissions)
+{!admin.md!}
+
+2. Select the **Show previews of uploaded and linked images** or the **Show
+previews of linked websites** checkbox.
+
+{!save-changes.md!} organization settings.

templates/zerver/help/index.md

@@ -128,6 +128,8 @@ is known as an **organization**.
 * [Allow anyone to join without an invitation](/help/allow-anyone-to-join-without-an-invitation)
 * [Only allow admins to invite new users](/help/only-allow-admins-to-invite-new-users)
 * [Only allow admins to create new streams](/help/only-allow-admins-to-create-new-streams-feature)
+* [Only allow admins to add emoji](/help/only-allow-admins-to-add-emoji)
+* [Allow image/link previews](/help/allow-image-link-previews)
 * [Prevent users from changing their name](/help/prevent-users-from-changing-their-name)
 * [Prevent users from changing their email address](/help/prevent-users-from-changing-their-email-address)
 * [Restrict editing of old messages and topics](/help/restrict-editing-of-old-messages-and-topics)

templates/zerver/help/only-allow-admins-to-add-emoji.md

@@ -0,0 +1,14 @@
+# Only allow admins to add emoji
+
+{!admin-only.md!}
+
+By default, any user in your Zulip organization can add custom emoji to the
+organization. You can change your organization's settings to only allow
+administrators to add new emoji.
+
+{!go-to-the.md!} [Organization permissions](/#organization/organization-permissions)
+{!admin.md!}
+
+2. Select the **Only admins may add emoji** checkbox.
+
+{!save-changes.md!} organization settings.