Add support for plausible analytics (#382)

Rhys Perry

11.02.2020 34ac982a4bf9558ad0734ec49a09c3b1cd6ef6ed

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<script async defer data-domain=”{{ .Site.Params.plausibleAnalytics.domain }}” src=”https://{{ .Site.Params.plausibleAnalytics.serverURL | default "plausible.io" }}/js/index.js”></script>