add on off boarding to external index

index.md

@@ -17,6 +17,12 @@ The How-to cards are intended to provide practical guidance in implementing Data
             "icon": "<i class=\"large material-icons\">sticky_note_2</i>",
             "link": "{{ '/cards#general' | relative_url }}"
         },
+        {
+            "title": "On&Off boarding",
+            "caption": "A new colleague joined or my current colleague will leave. What do I have to do?",
+            "icon": "<i class=\"large material-icons\">compare_arrows</i>",
+            "link": "{{ '/cards#on-offboarding' | relative_url }}"
+        },
         {
             "title": "Access",
             "caption": "How can I get access to systems and infrastructure?",