The cheat sheet uses the `asciidoc` markup language to demonstrate how
to set up third party markup renderers. The current example has the
following issues:
- It promotes a legacy tool that does not handle modern AsciiDoc
specifications
- It does not account for embedded preview renders
- It has no safety restrictions
By switching to `asciidoctor`, uses are suggested to utilize de
facto/standard tooling for AsciiDoc.
The `--embedded` parameter will strip out HTML tags that contain the
document (such as `<html></html>`) which aren't necessary for the
render, and actually end up as text in the document if left in.
The `--safe-mode` parameter (of which there are several profiles)
imposes [certain
policies](https://docs.asciidoctor.org/asciidoctor/latest/safe-modes/)
on the files it ingests and what the resulting output looks like. GitHub
itself uses the `secure` profile (the highest), which can be a good
starting point for those who are uncertain of what to do. By default, if
no mode is specified when `asciidoctor` runs it defaults to `unsafe`,
i.e. no safety guidelines at all.
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