Add details in the doc on CommonMark extension (#2034)

* Add details in the doc on CommonMark extension

* Update overview.md

docs/content/documentation/getting-started/overview.md

@@ -5,7 +5,9 @@ weight = 5
 
 ## Zola at a Glance
 
-Zola is a static site generator (SSG), similar to [Hugo](https://gohugo.io/), [Pelican](https://blog.getpelican.com/), and [Jekyll](https://jekyllrb.com/) (for a comprehensive list of SSGs, please see [Jamstack](https://jamstack.org/generators)). It is written in [Rust](https://www.rust-lang.org/) and uses the [Tera](https://tera.netlify.com/) template engine, which is similar to [Jinja2](https://jinja.palletsprojects.com/en/2.10.x/), [Django templates](https://docs.djangoproject.com/en/2.2/topics/templates/), [Liquid](https://shopify.github.io/liquid/), and [Twig](https://twig.symfony.com/). Content is written in [CommonMark](https://commonmark.org/), a strongly defined, highly compatible specification of [Markdown](https://www.markdownguide.org/).
+Zola is a static site generator (SSG), similar to [Hugo](https://gohugo.io/), [Pelican](https://blog.getpelican.com/), and [Jekyll](https://jekyllrb.com/) (for a comprehensive list of SSGs, please see [Jamstack](https://jamstack.org/generators)). It is written in [Rust](https://www.rust-lang.org/) and uses the [Tera](https://tera.netlify.com/) template engine, which is similar to [Jinja2](https://jinja.palletsprojects.com/en/2.10.x/), [Django templates](https://docs.djangoproject.com/en/2.2/topics/templates/), [Liquid](https://shopify.github.io/liquid/), and [Twig](https://twig.symfony.com/).
+
+Content is written in [CommonMark](https://commonmark.org/), a strongly defined, highly compatible specification of [Markdown](https://www.markdownguide.org/). Zola uses [pulldown-cmark](https://github.com/raphlinus/pulldown-cmark#pulldown-cmark) to parse markdown files. The goal of this library is 100% compliance with the CommonMark spec. It adds a few additional features such as parsing footnotes, Github flavored tables, Github flavored task lists and strikethrough.
 
 SSGs use dynamic templates to transform content into static HTML pages. Static sites are thus very fast and require no databases, making them easy to host. A comparison between static and dynamic sites, such as WordPress, Drupal, and Django, can be found [here](https://dev.to/ashenmaster/static-vs-dynamic-sites-61f).