In fact, it works like importing your project into the CVS Sources: for the homepage we use the CVS tree called webcvs.

1. First, you need to configure your SSH access - http://savannah.gnu.org/faq/?group_id=5802&question=Account_-_How_do_I_configure_my_SSH_access.txt .
2. You should have read instructions in your CVS project page on savannah (like the emacs CVS page http://savannah.gnu.org/cvs/?group=emacs).
3. You should go in the local directory where you want to put your local copy the CVS HTML tree. For example:
   mkdir ~/project/www
cd ~/project/www
4. Download the CVS HTML tree structure (substitute developername with your login and projectname with your project system name):
   export CVS_RSH=ssh
cvs -z3 -d:ext:developername@cvs.sv.gnu.org:/webcvs/projectname co projectname
5. Then, in the dir ~/project/www/projectname, you should copy all the files you want to insert in the CVS HTML tree. For example:
cp ~/tmp/index.html ~/project/www/projectname
6. Once you have localy set your HTML tree, you can import it. To import a file and a directory:
   cd ~/project/www/projectname
cvs add index.html
cvs add mydir
(or: cvs add index.html mydir)
   cvs commit