[georchestra] merge georchestra/datadir#435

roles/georchestra/templates/default.properties.j2

@@ -40,7 +40,13 @@ headerUrl=/header/
 # Stylesheet used to override default colors of header
 # More design can be set by overriding default classes & styles
 # Default empty string
-# georchestraStylesheet=http://my-domain-name/stylesheet.css
+# georchestraStylesheet=/public/stylesheet.css
+
+# Config file for the header webcomponent
+# You can use this file to change the menu design, add new items, etc.
+# Full configuration can be found here: https://github.com/georchestra/header/
+# Default empty string
+# headerConfigFile=/public/config.json
 
 # Logo URL
 # Used to set header's logo.