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Note: this is only the first step; the C sources won't be built until
the second step is done.

The actual build takes about 1.3s on cloud2 which still runs the docker
containers and image layers on the very slow spinning disk. cloud3 has
docker mounted on the SSD disk; measured speedups of 20-30%

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It would be probably good idea to also remove tools/docgen.py and
asciidoc.mk, but asciidoc.mk is still mentioned under `cloud/doc`, which
may contain some useful info which we'll need at least to review before
removing.

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Until I read the doc and find how to limit the retention,
otherwise it just eats all my ram and cpu and things start to fall
apart.

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Comments in headers are changed a bit: removed adoc-specific stuff,
markdown is used instead

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