remove PPC category after merging to publication

index.md

@@ -64,12 +64,6 @@ The How-to cards are intended to provide practical guidance in implementing Data
             "caption": "I want to publish my article",
             "icon": "<i class=\"large material-icons\">menu_book</i>",
             "link": "{{ '/cards#publication' | relative_url }}"
-        },
-        {
-            "title": "PPC",
-            "caption": "I need information on the pre-publication check (PPC)",
-            "icon": "<i class=\"large material-icons\">fact_check</i>",
-            "link": "{{ '/cards#ppc' | relative_url }}"
         }
     ];