huge upgrade to theme and pagefind search bar.

themes/hugo-book.backup/exampleSite/content.en/docs/shortcodes/experimental/cards.md

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+# Cards
+
+> [!WARNING]
+> Experimental, could change in the future or be removed
+
+## Example
+
+{{% columns %}}
+- {{< card image="placeholder.svg" >}}
+  ### Line 1
+  Line 2
+  {{< /card >}}
+
+- {{< card image="placeholder.svg" >}}
+  This is tab MacOS content.
+  {{< /card >}}
+{{% /columns %}}
+
+{{% columns %}}
+- {{< card href="/docs/shortcodes/experimental/cards" >}}
+  **Markdown**  
+  Suspendisse sed congue orci, eu congue metus. Nullam feugiat urna massa.
+  {{< /card >}}
+
+- {{< card >}}
+  Suspendisse sed congue orci, eu congue metus. Nullam feugiat urna massa, et fringilla metus consectetur molestie.
+  {{< /card >}}
+
+- {{< card title="Card" >}}
+  ### Heading
+  This is tab MacOS content.
+  {{< /card >}}
+{{% /columns %}}