huge upgrade to theme and pagefind search bar.

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

@@ -0,0 +1,23 @@
+{{- $attributes := partial "docs/text/mapper" (dict
+  "attributes" (cond .IsNamedParams .Params dict)
+  "merge" (dict
+    "class" "book-katex"
+  )
+) -}}
+{{- if .Inner -}}
+  {{- if .Get "display" -}}
+  <div {{ partial "docs/html-attrs" $attributes | safeHTMLAttr }}>{{ printf "\\[ %s \\]" .Inner }}</div>
+  {{- else -}}
+  <span {{ partial "docs/html-attrs" $attributes | safeHTMLAttr }}>{{ printf "\\( %s \\)" .Inner }}</span>
+  {{- end -}}
+{{- end -}}
+{{- if not (.Page.Store.Get "katex") -}}
+  {{- /* Include katex only first time */ -}}
+  <link rel="stylesheet" href="{{ "katex/katex.min.css" | relURL }}" />
+  {{- /* remove whitespaces */ -}}
+  <script defer src="{{ "katex/katex.min.js" | relURL }}"></script>
+  {{- with resources.Get "katex.json" | minify -}}
+    <script defer src="{{ "katex/auto-render.min.js" | relURL }}" onload="renderMathInElement(document.body, {{ .Content | safeJS }});"></script>
+  {{- end -}}
+  {{- .Page.Store.Set "katex" true -}}
+{{- end -}}