doc: Generate the man page from markdown

Because who wants to hand-write groff markup these days?

This adds pandoc(1) as a build-dependency.

It uses PHP Markdown Extra definition lists, which pandoc uses for e.g.
command option/explanation lists. Because this definition list format is
non-standard it might not render as intended on many markdown viewers,
but pandoc generates "better" man page output with it.

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