Merge pull request #410 from ESUG/MarcusDenker-patch-1

Update index.pillar: add link to slides 2025

Author: MarcusDenker

index.pillar

@@ -31,6 +31,8 @@ The European Smalltalk User Group (ESUG) is a non-profit user organization that
 - *Innovation Technology Awards 20th Edition>https://esug.github.io/2025-Conference/awardsCall2025.html*
 - *Conference Program>https://esug.github.io/2025-Conference/agenda.html*
 - *IWST Program>https://esug.org/2025-Conference/agenda-workshop.html* 
+- Slides on *Slideshare>https://www.slideshare.net/esug/presentations* and in the *ESUG Archive>http://archive.esug.org/ESUG2025/*
+
 
 % +Lille Vue Grand Place>file://2024-Conference/images/512/Lille_vue_gd_place_small.png+ Lille view of Grand Place ||