Use Hugo's partial-returning where possible

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

layouts/_partials/serieslink.html

@@ -3,9 +3,7 @@
     {{ if eq .direction "previous" }}{{ partial "icon.html" "chevrons-left" }}{{ end }}
     <div class="title-subtitle">
       {{ title .direction }} in Series
-      {{ $scratch := newScratch -}}
-      {{- partial "nameinseries.html" (dict "page" .page "scratch" $scratch) -}}
-      <div class="title">{{ $scratch.Get "name" }}</div>
+      <div class="title">{{ partial "nameinseries.html" (dict "page" .page) }}</div>
     </div>
     {{ if eq .direction "next" }}{{ partial "icon.html" "chevrons-right" }}{{ end }}
   </a>