user guides: Add ~30 titles for help articles.

templates/zerver/help/index.md

@@ -102,6 +102,18 @@ as a “**realm**”.
 * [Delete a stream (admin only)](/help/delete-a-stream)
 
 ## Notifications
+* Mute a stream
+* Mute a topic
+* Set notifications for a single stream
+* Configure desktop notifications
+* Configure audible notifications
+* Configure email notifications
+* Configure mobile push notifications
+* Add an alert word
+
+## Tools & Customization
+* Keyboard shortcuts
+* Add a bot or integration
 
 ## Apps
 * Zulip on Mac OS
@@ -112,6 +124,36 @@ as a “**realm**”.
 * Zulip in a terminal
 * Connect to Zulip over IRC/etc (not implemented?)
 
+# Administering a Zulip organization
+
+## Organization Settings
+* Change your organization's name
+* Restrict user email addresses to certain domains
+* Allow anyone to join without an invitation
+* Only allow admins to invite new users
+* Only allow admins to create new streams
+* Restrict editing of old messages and topics
+* Change the default language
+* Add custom emoji
+* Configure authentication methods
+* Add a custom linkification filter
+* Delete your organization (not implemented)
+
+## Users & Bots
+* Deactivate or reactivate a user
+* Deactivate or reactivate a bot
+* Make a user an administrator
+* Change a user's name
+* View the list of installed bots
+
+## Streams
+* Delete a stream
+* Set default streams for new users
+* Rename a stream
+* Change a stream's description
+* Make a public stream private
+* Add or remove users from a stream
+
 ---
 
 # Include Zulip