Maintains compatibility with mdbook 0.4.x.
Includes comments for what to remove once 0.5.x is the only we care
about. Some other changes technically could be changed at that point,
but currently serve to enable universal support of 0.4.x and 0.5.x
Fixes#1051.
Change-Id: Ic5b405038d180bcd357bbd9e5716879e0c26e5f5
manpages can be rendered using the markdown output of mdbook, the rest
of the manual can generated out of the main doc/manual source tree. we
still use lowdown to actually render manpages instead of eg mdbook-man
because lowdown does generate reasonably good manpages (though that is
also somewhat debatable, but they're a lot better than mdbook-man).
doing this not only lets us drastically simplify the lowdown pipeline,
but also remove all custom {{#include}} handling since now mdbook does
all of it, even for the manpage builds. even the lowdown wrapper isn't
entirely necessary because lowdown can take all wrapper arguments with
command line flags rather than bits of input file content.
This also implements running mdbook in Meson, in order to generate the
manpages. The mdbook outputs are also installed in the usual location.
Co-authored-by: Qyriad <qyriad@qyriad.me>
Change-Id: I60193f9fd0f15d48872f071af35855cda2a0f40b
helle