huge upgrade to theme and pagefind search bar.

themes/hugo-book.backup/layouts/_shortcodes/image.html

@@ -0,0 +1,10 @@
+{{- $destination := partial "docs/links/portable-image" (dict "Page" .Page "Destination" (.Get "src")) -}}
+{{- $attributes := partial "docs/text/mapper" (dict
+  "attributes" (cond .IsNamedParams .Params dict)
+  "keep" (slice "id" "class" "tabindex" "alt" "title" "loading")
+) -}}
+<label class="book-image" for="book-image-toggle-{{ .Ordinal }}">
+  <input class="hidden toggle" type="checkbox" id="book-image-toggle-{{ .Ordinal }}" />
+  <img src="{{ $destination | safeURL }}" {{ partial "docs/html-attrs" $attributes | safeHTMLAttr }} />
+</label>
+{{- /* remove whitespaces */ -}}