update site description for preview

config.yaml

@@ -7,8 +7,8 @@ theme: hugo-html5up-alpha
 disqusShortname: ""
 
 params:
-  description: Freifunk Leipzig Langigpage.
-  images: ["images/pic01.jpg"]
+  description: Mehr als nur freies WLAN
+  images: ["static/images/preview.jpg"]
   author: "Freifunk Leipzig"
   copyright: "[CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)"
   design: "Design: [HTML5 UP](http://html5up.net/) | [Nelson/Roberto](https://nelsonroberto.com/)"