docs: add documentation about gluon-web-network package

* document network roles and their effects

docs/index.rst

@@ -73,6 +73,7 @@ Several Freifunk communities in Germany use Gluon as the foundation of their Fre
   package/gluon-radv-filterd
   package/gluon-scheduled-domain-switch
   package/gluon-web-admin
+  package/gluon-web-network
   package/gluon-web-logging
 
 .. toctree::

docs/package/gluon-web-network.rst

+gluon-web-network
+=================
+
+The package *gluon-web-network* is part of the :ref:`Feature Flag <user-site-feature-flags>` web-advanced.
+It allows to configure the roles of the gluon nodes network interfaces in config mode through checkboxes.
+
+It is a user-friendly way to configure what otherwise would need the :ref:`wired-mesh-commandline`.
+
+.. image:: gluon-web-network.png
+
+configuration options
+---------------------
+
+The following roles can be assigned to the interfaces:
+* `Uplink` - interface is used for WAN connection, which is used for the VPN if `mesh-vpn` checkbox is enabled in basic config mode
+* `Mesh` - interface is used for :doc:`../features/wired-mesh`. Using this on the WAN interface is also known as "Mesh-on-WAN"
+* `Client` - interface is used as client network - connected devices to this interface should get a working internet configuration through DHCP
+
+The roles `Uplink`/`Mesh` and `Client` are mutually exclusive.