Add preconnect and preload (#805)

* Add preconnect and preload

* Fix whitespace control

src/includes/head.liquid

@@ -2,8 +2,17 @@
   <meta charset="utf-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
-
   <title>{{ seo.title | escape }}</title>
+
+  <link rel="preload" href="/assets/fonts/icomoon/fonts/icomoon.woff2">
+  <link rel="preload" href="/assets/fonts/inter/Inter-Regular.woff2">
+  <link rel="preload" href="/assets/fonts/inter/Inter-SemiBold.woff2">
+
+  {%- if siteEnv == 'production' and site.google_analytics -%}
+  <link rel="preconnect" href="https://www.google-analytics.com">
+  {%- endif %}
+  <link rel="preconnect" href="https://s.ytimg.com">
+
   <link rel="canonical" href="{{ seo.canonicalURL | escape }}" />
   <meta name="description" content="{{ seo.description | escape }}" />