Breaking change: switch to '{{%' decorators in shortcodes to better support shortcode-in-shortcode

exampleSite/content.en/docs/shortcodes/katex.md

@@ -6,9 +6,7 @@ title: KaTeX
 KaTeX shortcode let you render math typesetting in markdown document. See [KaTeX](https://katex.org/)
 
 ## Example
-
-<div class="book-columns flex flex-wrap">
-  <div class="flex-even markdown-inner">
+{{% columns %}}
 
 ```latex
 {{</* katex display=true class="optional" >}}
@@ -16,15 +14,13 @@ f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
 {{< /katex */>}}
 ```
 
-  </div>
-  <div class="flex-even markdown-inner">
+<--->
 
 {{< katex display=true class="optional" >}}
 f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
 {{< /katex >}}
 
-  </div>
-</div>
+{{% /columns %}}
 
 ## Display Mode Example