How to build dlang.org dd files

[Mike via Digitalmars-d-learn]

I've been trying to update some documentation on dlang.org.  The 
instructions at 
https://github.com/D-Programming-Language/dlang.org/blob/master/CONTRIBUTING.md 
say I should be able to do

make -f posix.make file.html

This doesn't seem to work, as I get "no rule t omake target 
'file.html'.

I tried 'make -f posix.mak' and that requires dmd, druntime, and 
maybe a mess of other things, and takes forever.  And ultimately 
it fails with 'No rule to make target 'release'.  Stop.'

Isn't there any easy one-liner I can use to render a single .dd 
file to html to test my changes?

Thanks,
Mike