Do not unique-by-series when a flag is set

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/partials/post.html

@@ -18,10 +18,12 @@
     {{- if .linkSeries -}}
     {{- $term := index (.page.GetTerms "series") 0 -}}
     {{- with $term -}}
+    {{- if (not ($term.Param "donotunique")) -}}
     <div class="series-link">
     {{- partial "icon.html" "corner-down-right" -}}
     <p>{{- i18n "latestInSeries" }} <a href="{{ $term.Permalink }}">{{ $term.Title }}</a></p>
     </div>
     {{- end -}}
+    {{- end -}}
     {{- end }}
 </li>