Use Redcarpet instead of Kramdown (default) for Markdown processing in Jekyll

_config.yml

markdown: redcarpet # this might be set to "kramdown" currently
redcarpet:
  extensions: # these are optional, see: https://github.com/vmg/redcarpet#and-its-like-really-simple-to-use
  - autolink
  - fenced_code_blocks
  - lax_spacing
  - strikethrough
  - superscript
  - tables
  - footnotes
  - highlight

Gemfile

source 'http://rubygems.org'

gem 'jekyll'

group :jekyll_plugins do
  gem 'redcarpet'
end