Add blog functionality (#1)

themes/hugo-sustain/layouts/shortcodes/links.html

@@ -0,0 +1,18 @@
+{{- $type := .Get "type" -}} <!-- e.g. "media" -->
+{{- $data := .Site.Data.links -}}
+{{- if $type -}}
+  {{- $data = where $data "type" $type -}}
+{{ end }}
+{{- range sort $data "date" "desc" }}
+  <ul>
+    <li>{{.desc}} – 
+    {{- $len := (len .links) -}} <!-- amount of elements under .links -->
+      {{- range $index, $element := .links -}} <!-- range over links, but keep index -->
+        {{ with .href }}<a href="{{.}}">{{ end }}{{.text}}{{ with .href }}</a>{{end}}
+        {{- if ne (add $index 1) $len -}}, {{- end -}} <!-- only append comma if not last element (index starts with 0) -->
+      {{- end -}}
+      {{- with .date }} ({{.}}){{ end }} 
+      {{ range .tags }}<span class="label label-success">{{ . }}</span>&nbsp;{{ end }}
+    </li>
+  </ul>
+{{ end }}