Refactor styling to drop PostCSS Update custom_css logic (ensure retrocompat)

Regis Philibert

15.57.2021 c82f806d8c039d7d02a88dd984247dfe210abe91

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{{ if .Site.Params.favicon }}
<link rel="shortcut icon" href="{{ relURL ($.Site.Params.favicon) }}" type="image/x-icon" />
{{ end }}