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digitalmars.D - How do I use DDoc?

I'm about to go to bed and I can't keep my eyes open, so sorry if the
answer to this is obvious.

I cloned '
https://github.com/D-Programming-Language/d-programming-language.org' and I
want to work on documentation.  I've read
http://www.digitalmars.com/d/2.0/ddoc.html, but maybe I've missed it.

1. How do I get dmd to generate the HTML files from all those *.dd files?
I run 'dmd -Dddocdir *.dd' and it creates 'docdir' folder with bunch of
HTML files, but they are only a few KBs with no content.  What am I doing
wrong?

2. What are the *.ddco for?  Do they contain the predefined macros?  If so,
why are some of them missing than what's listed on that page?
Nov 11 2011