Update images for board members in persons.yml

Author: pignatiadis

_data/persons.yml

@@ -1,21 +1,21 @@
 - name: Niklas Börstinghaus
   function: "1. Vorsitzender"
   active: true
-  image: "img/persons/niklas-boerstingshaus2.jpg"
+  image: "img/persons/niklas-boerstingshaus25.jpg"
   order: 0_vorstand_1
   boardmember: true
 
 - name: Paul Ignatiadis
   function: "2. Vorsitzender"
   active: true
-  image: "img/persons/paul-ignatiadis.jpg"
+  image: "img/persons/paul-ignatiadis25.jpg"
   order: 0_vorstand_2
   boardmember: true
 
 - name: Jannis Bergmann
   function: "3. Vorsitzende"
   active: true
-  image: "img/persons/jannis-bergmann.jpg"
+  image: "img/persons/jannis-bergmann25.jpg"
   order: 0_vorstand_3
   boardmember: true