I started by writing tests for sys.Ioctl but after I had 100% coverage
of that function it occurred to me the function could be eliminated.
Related #1062
This simplifies the website toolchain to no longer depend on an external
repository, and allows developing the genblog command in lockstep with the needs
of the website.
Second half to PR #801, this updates to latest module dependencies.
Note: this pins golang.org/x/sys to an older version, as more recent
versions introduce a yet-to-be-determined bug on Darwin.