feat: add three different media as blog types as testing objects, with infos on list

themes/hugo-sustain/layouts/partials/blog/pre-headline.html

@@ -0,0 +1,9 @@
+{{- $cats := .Page.Params.categories }}
+{{- $symbols := dict "news" "🗞️" "presentation" "🎤" "podcast" "🎧" }}
+{{- $selection := "" }}
+{{- range $cat := $cats }}
+  {{- with index $symbols $cat }}
+    {{- $selection = (printf "%s  " .) | safeHTML }}
+  {{- end }}
+{{- end }}
+{{- return $selection }}