move away from asciidoc
asciidoc is the only part of the tor build process that requires python 2. python 2 is deprecated upstream and is approaching end-of-life.
Over in https://bugs.debian.org/892830 , i asked about upgrading asciidoc to move to python3, but apparently asciidoc itself is on life support, and upstream is encouraging everyone to move to asciidoctor instead (which introduces a ruby dependency) or to use something else like pandoc.
in any case, presumably we want the documentation to stay buildable, so i encourage switching away from asciidoc.
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