add date and author in post page

themes/le_filament/layouts/posts/single.html

 {{ define "main" }}
 <main id="main">
   <article>
+    <span>{{ if not .Date.IsZero }}le {{ .Date.Format "02/01/2006" }}{{ end }}{{ if and ( not .Date.IsZero ) ( isset .Params "author" ) }} {{ end }}{{ if isset .Params "author" }}par {{ .Params.author }}{{ end }}</span>
     <h1>{{ .Title }}</h1>
     {{ .Content }}
   </article>