Added txtpen in tutorial (#6021)

Merge pull request 6021
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Ricky Han 2017-04-13 08:13:18 -04:00 committed by jekyllbot
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@ -6,6 +6,16 @@ permalink: /docs/extras/
There are a number of (optional) extra features that Jekyll supports that you
may want to install, depending on how you plan to use Jekyll.
## Web Highlights and Commenting
Register your site with [txtpen](https://txtpen.com). Then append
```html
<script src="https://txtpen.com/embed.js?site=<your site name>" />
```
to your template files in `/_layout` folder.
## Math Support
Kramdown comes with optional support for LaTeX to PNG rendering via [MathJax](https://www.mathjax.org) within math blocks. See the Kramdown documentation on [math blocks](http://kramdown.gettalong.org/syntax.html#math-blocks) and [math support](http://kramdown.gettalong.org/converter/html.html#math-support) for more details. MathJax requires you to include JavaScript or CSS to render the LaTeX, e.g.