#352: move english content to content.en

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

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+# KaTeX
+
+KaTeX shortcode let you render math typesetting in markdown document. See [KaTeX](https://katex.org/)
+
+## Example
+{{< columns >}}
+
+```latex
+{{</*/* katex [display] [class="text-center"] */*/>}}
+f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
+{{</*/* /katex */*/>}}
+```
+
+<--->
+
+{{< katex display >}}
+f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
+{{< /katex >}}
+
+{{< /columns >}}
+
+## Display Mode Example
+
+Here is some inline example: {{< katex >}}\pi(x){{< /katex >}}, rendered in the same line. And below is `display` example, having `display: block`
+{{< katex display >}}
+f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
+{{< /katex >}}
+Text continues here.