Clean up directory structure of partials and .Render templates

layouts/partials/post-meta-item/series.html

@@ -0,0 +1,12 @@
+{{ with (.GetTerms "series") }}
+
+{{ $series := slice }}
+{{ range . }}
+{{ $series = $series | append (printf `<a href="%s">%s</a>` .Permalink .LinkTitle) }}
+{{ end }}
+
+<div class="series">
+    {{ partial "icon.html" "files" }}
+    {{ delimit $series ", " }}
+</div>
+{{ end }}