[horde] Missing link for Horde 4 docs/INSTALL on website

[Bruno Costacurta]

> Can you be more specific about where you see a broken link to github  
> for Horde documentation on our website? AFAIK all the doc links  
> should display the docs directly on the site.
> --
> Mike

 From following page (author is Jan Schneider) as the Horde 4 announce.

http://lists.horde.org/archives/announce/2011/000607.html

Hope it helps.
Bye,
Bruno