feat: Implement basic general folder support (#2051)

- Related: #1748

docs/configuration/cameras/_sidebar.md

@@ -7,6 +7,7 @@
     - [`engine`](engine.md)
   - [`conditions`](../conditions.md)
   - [`dimensions`](../dimensions.md)
+  - [`folders`](../folders.md)
   - [`elements`](../elements/README.md)
   - [`image`](../image.md)
   - [`live`](../live.md)