Add slug to card layers

fix for issue https://gitlab.lcsb.uni.lu/R3-core/howto-cards-internal/-/issues/116

.ci/generateIndex.py

@@ -34,7 +34,7 @@ def build_section_start(title, shortcut):
     title = title.replace("Covid 19", "COVID-19")
     title = title.replace("Ppc", "PPC")
 
-    return f'\n\t<div class="index-box noborderbox" id="{shortcut}">\n\t\t<h3>{title}</h3>\n\t\t<ul>\n'
+    return f'\n\t<div class="index-box noborderbox" id="{shortcut}-card">\n\t\t<h3>{title}</h3>\n\t\t<ul>\n'
 
 def build_section_end():
     return "\t\t</ul>\n\t</div>"