built-in documentation for Linux package

[qrkourier]

Install a user manual (man) for each Linux package after they're available in #911

[qrkourier]

Needed:

• man 1 openziti user manual
• man 8 openziti-controller sysadmin manual
• man 8 openziti-router sysadmin manual

[qrkourier]

Have you already discussed this, @plorenz, @ekoby, or @scareything? I've read plenty of man pages but have yet to write any. 🙂

The man page for the ziti CLI is an opportunity to be extremely helpful and valuable to the server administrator with built-in, authoritative documentation.

As for tooling, I like the idea of maintaining Markdown manuals in the main Ziti repo that are automatically translated to man pages for each Linux package. This will be nicer for the maintainers because only one set of authoritative docs is needed, and it's probably a simple matter to convert the formats and lint the output in CI. I'll happily help with that last part and maintain the documentation sources.

Ideally, we'll use the same tools and approach for this user manual and the one for zrok.

[plorenz]

The markdown -> man approach seems nice