Revert "Add the ability for post headers to be links when you add a link parameter to the page front matter"

This reverts commit d68e76478d.

layouts/partials/content_header.html

@@ -1,7 +1,7 @@
 <header>
   {{ partial "development/draft_tag.html" . }}
   <div class="post-title">
-    <h1>{{ .Title }}{{ with .Params.link }}<a class="link-arrow" href="{{ . }}">→</a>{{ end }}</h1>
+    <h1>{{ .Title }}</h1>
     {{ if not (eq .Section "about") }}
       <div class="post-date"><time>{{ .Date | time.Format "January 2, 2006" }}</time></div>
     {{ end }}