This commit adds minimal documentation of the supported platforms.
More exhaustive documentation would require producing a list of
platforms for each of the 7 tiers. This was attempted in #245368, but it
quickly became clear that that would be a long-term effort.
In the meantime, this commit adds the most important information to the
manual.
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
also updates nixdoc to 2.3.0. the nixdoc update is not a separate commit
because that would leave the manual build broken for one commit,
potentially breaking bisects and rebases.
