Use absolute path for favicon so it appears on all pages.

themes/briar/layouts/partials/head.html

@@ -11,8 +11,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta name="flattr:id"
         content="{{ with .Param "flatterid" }}{{ . }}{{ end }}">
-<link rel="icon" type="image/x-icon" href="img/briar_logo_white.ico">
-<link rel="icon" type="image/png" href="img/briar_logo_circle.png">
+  <link rel="icon" type="image/x-icon" href="/img/briar_logo_white.ico">
+  <link rel="icon" type="image/png" href="/img/briar_logo_circle.png">
 
   <link href="/news/index.xml" rel="alternate" type="application/rss+xml" title="Briar News" />
   <link href="/index.xml" rel="alternate" type="application/rss+xml" title="Briar - All changes" />