fixed missing .jpg in 5-years ESMValTool post

Author: axel-lauer

_posts/2020-12-18-5-years-ESMValTool.md

@@ -4,5 +4,7 @@ title: 5 years ESMValTool!
 date: 2020-12-18
 ---
 
-Version 1.0 of the ESMValTool was released on 18 December 2015 - 
-[5 years ESMvalTool!](https://www.esmvaltool.org/images/5-years-ESMValTool.jpg)
+Version 1.0 of the ESMValTool was released on 18 December 2015! 
+
+![5 years ESMValTool!](/assets/img/5-years-ESMValTool.jpg){:style="margin-bottom: 32px;"}
+