Fix reading time appear on all files

layouts/partials/single-header.html

@@ -1,11 +1,14 @@
-{{ $image := (.Resources.ByType "image").GetMatch "images/*featured*" }}
-
 <div class="content-inner full-width header">
     <h1 class="single-title">{{ .Title }}</h1>
     <p class="single-description">{{ .Description | markdownify }}</p>
     {{ if and ( .Lastmod ) ( ne .Lastmod .PublishDate) }}
     <time class="single-date" datetime="{{ .Lastmod }}" title="{{ .Lastmod }}">Last updated {{ .Lastmod.UTC.Format "January" }} {{ .Lastmod.UTC.Format "2" | humanize }}, {{ .Lastmod.UTC.Format "2006" }}.</time>
     {{ end }}
+    
+
+{{ if and (in (printf "/%s/" .File.Dir) "/posts/") (ne .File.BaseFileName "_index") }}
     <a class="post-reading-time">{{ printf "Estimated reading time: %d minutes" .ReadingTime }}</a>
+{{ end }}
+
 </div>
 <hr/>