Introduce SCSS plugins: dark mode and numbered headings

layouts/partials/docs/html-head.html

@@ -3,9 +3,10 @@
 {{- template "_internal/opengraph.html" . -}}
 
 <title>{{ partial "docs/title" . }} | {{ .Site.Title -}}</title>
+<link rel="icon" href="{{ "favicon.png" | relURL }}" type="image/x-icon">
 
 <!-- Theme stylesheet, you can customize scss by creating `assets/custom.scss` in your website -->
-{{- $styles := resources.Get "book.scss" | resources.ToCSS | resources.Minify | resources.Fingerprint }}
+{{- $styles := resources.Get "book.scss" | resources.ExecuteAsTemplate "book.scss" . | resources.ToCSS | resources.Minify | resources.Fingerprint }}
 <link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Integrity }}">
 
 {{ if default true .Site.Params.BookSearch }}
@@ -13,8 +14,7 @@
 <script defer src="{{ $searchJS.RelPermalink }}" integrity="{{ $searchJS.Data.Integrity }}"></script>
 {{ end }}
 
-<!-- Favicon -->
-<link rel="icon" href="{{ "favicon.png" | relURL }}" type="image/x-icon">
+{{- template "_internal/google_analytics_async.html" . -}}
 
 <!-- RSS -->
 {{ with .OutputFormats.Get "rss" -}}
@@ -25,5 +25,3 @@
 Made with Book Theme
 https://github.com/alex-shpak/hugo-book
 {{ "-->" | safeHTML }}
-
-{{ template "_internal/google_analytics_async.html" . }}

layouts/partials/docs/menu-bundle.html

@@ -13,7 +13,7 @@
 
   <style>
   nav ul a[href{{ $attrEq }}"{{ $attrVal }}"] {
-      color: {{ default "#004ed0" .Site.Params.BookMenuBundleActiveLinkColor }};
+    color: {{ default "#004ed0" .Site.Params.BookMenuBundleActiveLinkColor }};
   }
   </style>
 {{ end }}