feat(page): re-apply markdownify on author names

Close #761

layouts/partials/page_metadata.html

@@ -8,7 +8,7 @@
   <div>
     {{ range $k, $v := $.Params.authors -}}
     <span itemscope itemprop="author" itemtype="http://schema.org/Person">
-      <span itemprop="name">{{- $v -}}</span>
+      <span itemprop="name">{{- $v | markdownify -}}</span>
     </span>
     {{- if lt $k (sub $authorLen 1) -}}, {{ end }}
     {{ end }}