Enhancement: allow disabling the filesystem consumer (#9199)

docs/setup.md

@@ -714,6 +714,8 @@ the Pi and configuring some options in paperless can help improve
 performance immensely:
 
 -   Stick with SQLite to save some resources.
+-   If you do not need the filesystem-based consumer, consider disabling it
+    entirely by setting [`PAPERLESS_CONSUMER_DISABLE`](configuration.md#PAPERLESS_CONSUMER_DISABLE) to `true`.
 -   Consider setting [`PAPERLESS_OCR_PAGES`](configuration.md#PAPERLESS_OCR_PAGES) to 1, so that paperless will
     only OCR the first page of your documents. In most cases, this page
     contains enough information to be able to find it.