Revert head template to hbs

Author: kategengler

app/templates/head.gjs

@@ -0,0 +1,10 @@
+<link rel="dns-prefetch" href="{{this.model.cdnDomain}}">
+
+{{#if this.model.description}}
+  <meta name="description" content={{this.model.description}}>
+  <meta property="og:description" content={{this.model.description}}>
+{{/if}}
+
+{{#unless this.model.isRelease}}
+  <link rel="canonical" href={{this.model.canonicalUrl}}>
+{{/unless}}