refactor: migrate to new template system introduced in Hugo v0.146.0 (#1232)

See: https://gohugo.io/templates/new-templatesystem-overview/

layouts/_partials/head/head.html

@@ -0,0 +1,26 @@
+<meta charset='utf-8'>
+<meta name='viewport' content='width=device-width, initial-scale=1'>
+
+{{- $description := partialCached "data/description" . .RelPermalink -}}
+<meta name='description' {{ printf "content=%q" $description | safeHTMLAttr }}>
+{{ with .Params.Keywords }}<meta name="keywords" content="{{ delimit . ", " }}">{{ end }}
+
+{{- $title := partial "data/title" . -}}
+<title>{{ $title }}</title>
+
+<link rel='canonical' href='{{ .Permalink }}'>
+
+{{- partial "head/style.html" . -}}
+{{- partial "head/script.html" . -}}
+{{- partial "head/opengraph/include.html" . -}}
+
+{{- range .AlternativeOutputFormats -}}
+    <link rel="{{ .Rel }}" type="{{ .MediaType.Type }}" href="{{ .Permalink | safeURL }}">
+{{- end -}}
+
+{{ with .Site.Params.favicon }}
+    <link rel="shortcut icon" href="{{ . | relURL }}" />
+{{ end }}
+
+{{- partial "google_analytics.html" . -}}
+{{- partial "head/custom.html" . -}}