doc: Switch to asciidoctor to format docs asciidoc and a2x are no longer actively maintained and Debian policy encourages people to move away from them to asciidoctor. Signed-off-by: Keith Packard <keithp@keithp.com>
doc: Finish converting docs to asciidoc format Signed-off-by: Keith Packard <keithp@keithp.com>