fixup links

layouts/index.html

@@ -45,7 +45,7 @@ site.RegularPages "Section" $pageurl }} {{- with $pages }}
 <section class="post-list">
   <h2>Browse by series</h2>
   {{ range $link, $name := $.Site.Data.home.series }}
-  <article><a href="{{ $link }}">{{ $name }}</a></article>
+  <article><a href="{{ $link }}/">{{ $name }}</a></article>
   {{ end }}
 </section>
 {{ partial "list-limited.html" "posts;posts" }} {{ partial "list-limited.html"

layouts/shortcodes/next-up.html

@@ -1,4 +1,4 @@
-{{ $tag := .Get 0 }} {{ $param := .Get 1 }} {{ $next := sort (where (sort
+{{ $tag := .Get 0 }} {{ $param := .Get 1 }} {{ $next := where (where (sort
 site.RegularPages "Date" "asc") ".Date" "gt" .Page.Date) ".Params.tags"
 "intersect" (slice $tag) | first 1 }} {{ with $next }} {{ $page := index . 0 }}
 <h3>