[Feature Request] Ability to switch flavor of Markdown

[Kachilero]

Description

Add setting to switch between flavors of Markdown - ie Github, plain, custom

Motivation

Different Markdown flavors have slightly different ways of handling things like linking within the document. For example, Github flavored in-document linking doesn't currently work. It opens a new "page" instead of scrolling to the anchor position on the page. Also, as someone who is a designer, I would like to be able to use my own CSS for the output.

[gmccullo]

Line breaks are handled differently in different flavos too.

+1 to custom CSS.

[MAHDTech]

+1 for GitHub flavored markdown.

Possibly some insight can be gained from here