Build just one doc manual in html?

[Mark Polesky]

In the CG section called "Building a single document", an
example is given for generating one manual in pdf:
    
cd build/
cd Documentation/
touch ../../Documentation/contributor.texi
make out=www out-www/contributor.pdf
    
http://lilypond.org/doc/v2.19/Documentation/contributor/generating-documentation#building-a-single-document

I want to do the same thing for an html document (as opposed
to pdf), like notation/index.html.  How can I do that?

Thanks.   
- Mark