Update doc (#57)

* readme: update unmanaged remotes doc

* readme: clarify system/user behaviour.

README.md

@@ -90,11 +90,6 @@ Alternatively, it is possible to merge declared remotes with the default one wit
   }];
 ```
 
-**Note**: currently no state management has been implemented for `remotes`.
-Removing a remote for the config declaration won't delete it from the system. 
-A manual `flatpak remote-delete [...]` is required. Improving remote management
-is planned for future releases.
-
 ### Packages
 Declare packages to install with:
 ```nix
@@ -108,13 +103,22 @@ You can pin a specific commit setting `commit=<hash>` attribute.
 
 Rebuild your system (or home-manager) for changes to take place.
 
-##### Unmanaged packages
+##### Unmanaged packages and remotes
+
+By default `nix-flatpak` will only manage (install/uninstall/update) packages declared in the
+`services.flatpak.packages` and repositories declared in `services.flatpak.remotes`.
+Flatpak packages and repositories installed by the command line of app stores won't be affected.
+
+Set `services.flatpak.uninstallUnmanaged = true` to alter this behaviour, and have `nix-flatpak` manage the
+lifecycle of all flatpaks packages and repositories.
 
-By default `nix-flatpak` will only managed (install/uninstall/update) packages declared in the
-`services.flatpak.packages`. Flatpak installed by the command line of app stores won't be affected.
+Note that `services.flatpak.uninstallUnmanaged` will only affect a given `system` of `user` installation
+target. If `nix-flatpak` is installed as a HomeManager module all packages/remotes will be managed
+in a `user` installation. Packages/remotes installed system-wide won't be affected
+by `services.flatpak.uninstallUnmanaged`.
 
-Set `services.flatpak.uninstallUnmanagedPackages = true` to alter this behaviour, and have `nix-flatpak` manage the
-lifecyle of all flatpaks installed on the system.
+Similarly, when `nix-flatpak` is installed as a NixOs module, only system-wide config will
+be affected.
 
 ### Updates