docs: move api and cli docs routes to reference/ (#14241)

docs/reference/cli/notifications.md

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+<!-- DO NOT EDIT | GENERATED CONTENT -->
+
+# notifications
+
+Manage Coder notifications
+
+Aliases:
+
+- notification
+
+## Usage
+
+```console
+coder notifications
+```
+
+## Description
+
+```console
+Administrators can use these commands to change notification settings.
+  - Pause Coder notifications. Administrators can temporarily stop notifiers from
+dispatching messages in case of the target outage (for example: unavailable SMTP
+server or Webhook not responding).:
+
+     $ coder notifications pause
+
+  - Resume Coder notifications:
+
+     $ coder notifications resume
+```
+
+## Subcommands
+
+| Name                                             | Purpose              |
+| ------------------------------------------------ | -------------------- |
+| [<code>pause</code>](./notifications_pause.md)   | Pause notifications  |
+| [<code>resume</code>](./notifications_resume.md) | Resume notifications |