remove Gitosis

Progit2 no longer talks about Gitosis so that it is little bit wierd.

Author: pismute

book/04-git-server/sections/git-daemon.asc

@@ -41,7 +41,7 @@ respawn
 ----
 
 For security reasons, it is strongly encouraged to have this daemon run as a user with read-only permissions to the repositories – you can easily do this by creating a new user 'git-ro' and running the daemon as them.
-For the sake of simplicity we'll simply run it as the same 'git' user that Gitosis is running as.
+For the sake of simplicity we'll simply run it as the same 'git' user that `git-shell` is using as.
 
 When you restart your machine, your Git daemon will start automatically and respawn if it goes down.
 To get it running without having to reboot, you can run this: