GCC wwwdocs move to git done

[Jose E. Marchesi]

Hi Joseph.

    I've done the move of GCC wwwdocs to git (using the previously posted and 
    discussed scripts), including setting up the post-receive hook to do the 
    same things previously covered by the old CVS hooks, and minimal updates 
    to the web pages dealing with the CVS setup for wwwdocs.

Belated thanks! :)