huge upgrade to theme and pagefind search bar.

themes/hugo-book.backup/layouts/_partials/docs/links/portable-link.html

@@ -0,0 +1,35 @@
+{{- $destination := .Destination -}}
+{{- $url := urls.Parse .Destination -}}
+
+{{- $isRemote := $url.IsAbs -}}
+{{- $isFragment := strings.HasPrefix .Destination "#" -}}
+
+{{- if and (not $isRemote) (not $isFragment) -}}
+  {{- $path := strings.TrimPrefix "./" $url.Path -}}
+  {{- $path = strings.TrimSuffix ".md" $path -}}
+  {{- $path = strings.TrimSuffix "/_index" $path -}}
+
+  {{- with (.Page.GetPage $path) -}}
+    {{- $destination = .RelPermalink -}}
+  {{- else with (.Page.Resources.Get $path) -}}
+    {{- $destination = .RelPermalink -}}
+  {{- else with (resources.Get $path) -}}
+    {{- $destination = .RelPermalink -}}
+  {{- else -}}
+    {{- $mode := .Page.Site.Params.BookPortableLinks -}}
+    {{- $message := printf "Image reference '%s' not found in '%s'" .Destination .Page.RelPermalink -}}
+    {{- if eq $mode "warning" -}}
+    {{- warnf $message -}}
+    {{- else if eq $mode "error" -}}
+    {{- errorf $message -}}
+    {{- end -}}
+  {{- end -}}
+
+  {{- with $url.RawQuery -}}
+    {{- $destination = print $destination "?" . -}}
+  {{- end -}}
+  {{- with $url.Fragment -}}
+    {{- $destination = print $destination "#" . -}}
+  {{- end -}}
+{{- end -}}
+{{- return $destination -}}