katacoda runner: Convert asciidoc syntax to MarkDown

[denise-khuu]

Since a lot of people seem to use asciidoc syntax and not just plain text in their tutorials, we need to convert them to markdown
exp: Katacoda will print "==Title" as "==Title" and not just bold

Links:
Convert asciidoc to Github Flavored Markdown

https://gist.github.com/cheungnj/38becf045654119f96c87db829f1be8e
https://pandoc.org/