Add footer for ids theme

Change-Id: If85c9fe027fb9cc45677068474b21d15d32e7134
diff --git a/examples/ids.Rmd b/examples/ids.Rmd
index 9196688..cdd895d 100644
--- a/examples/ids.Rmd
+++ b/examples/ids.Rmd
@@ -1,8 +1,8 @@
 ---
-title: "Untitled"
+title: "IDS theme for revealjs demo"
 author: Marc Kupietz
 institute: "IDS Mannheim"
-date: 2024-01-01
+date: "Mannheim, 2024-01-01"
 output: 
   revealjs::revealjs_presentation:
     theme: ids
@@ -15,6 +15,7 @@
       - chalkboard
       - menu
     reveal_options:
+      slideNumber: true
       chalkboard:
         theme: chalkboard
         toggleNotesButton: true