Add copyright info to hoodselector map screenshot

[ghost]

The docs of the hoodselector contain a screenshot of OpenStreetMap (i guess). As by https://www.openstreetmap.org/copyright the map material should be credited somehow.

Could someone add a copyright info to the screenshot? Maybe @2tata ?

https://github.com/freifunk-gluon/gluon/blob/master/docs/package/gluon-hoodselector.rst
https://gluon.readthedocs.io/en/latest/package/gluon-hoodselector.html

At least it would be fair, wouldn't it?

[mweinelt]

https://shells.darmstadt.ccc.de/~hexa/gluon/1821/package/gluon-hoodselector.html

Yay? Nay?

commit 798236b3cf443b50f0a847f18032a9728c43f957
Author: Martin Weinelt <[email protected]>
Date:   Tue Sep 17 13:21:16 2019 +0200

    docs: gluon-hoodselector: add openstreetmap copyright
    
    Fixes #1821

diff --git a/docs/package/gluon-hoodselector.rst b/docs/package/gluon-hoodselector.rst
index e1ddc4a6..2600fc0f 100644
--- a/docs/package/gluon-hoodselector.rst
+++ b/docs/package/gluon-hoodselector.rst
@@ -28,7 +28,10 @@ A domain is defined by geostationary fixed shapes by using longitude & latitude
 in combination with the domain configuration system. Below you can see a visual
 example of a regional domain:
 
-.. image:: gluon-hoodselector-domainmap.jpeg
+.. figure:: ./gluon-hoodselector-domainmap.jpeg
+    :alt: Regional domains visualized as shapes defined by latitude & longitude
+
+    © OpenStreetMap contributors
 
 Behaviour
 ------------------
@@ -36,7 +39,7 @@ Behaviour
 The following is an abstract state diagramm which gives an overview
 of the process:
 
-.. image:: gluon-hoodselector.svg
+.. image:: ./gluon-hoodselector.svg
 
 The sequence of this diagram reflects the priority of its running modes.
 Each mode will be explained separately below.
@@ -78,7 +81,7 @@ two coordinates per box are needed to define it (see below for an
 example). The second one uses polygons which can have multiple edges.
 Each domain can hold multiple shapes.
 
-.. image:: gluon-hoodselector-rectangle-example.svg
+.. image:: ./gluon-hoodselector-rectangle-example.svg
 
 site.conf
 ---------