exampleSite: Test plausible analytics

Author: bep

exampleSite/layouts/partials/head.html

@@ -4,4 +4,5 @@
     {{ $css = $css | minify | fingerprint }}
 {{ end }}
 <link rel="stylesheet" href="{{ $css.RelPermalink }}"></link>
+<script defer data-domain="staticbattery.com" src="https://plausible.io/js/plausible.js"></script>