Fix multilingual home page avatar (#134)

layouts/partials/home.html

@@ -1,7 +1,7 @@
 <section class="container centered">
   <div class="about">
     {{ with .Site.Params.avatarurl }}
-      <div class="avatar"><img src="{{ . }}" alt="avatar"></div>
+      <div class="avatar"><img src="{{ . | relURL }}" alt="avatar"></div>
     {{ end }}
     <h1>{{ .Site.Params.author }}</h1>
     <h2>{{ .Site.Params.info }}</h2>