Update liveusb-creator Git repo URL.

wiki/src/todo/usb_install_and_upgrade.mdwn

@@ -69,8 +69,8 @@ Our plan is to:
 
 Our work on liveusb-creator is in a Git repository:
 
-- anonymous, read-only: `git://webmasters.boum.org/liveusb-creator`
-- developers read-write: `ssh://gitolite@webmasters.boum.org/liveusb-creator.git`
+- anonymous, read-only: `git://git.immerda.ch/tails/liveusb-creator.git`
+- developers read-write: `ssh://git@git.immerda.ch/tails/liveusb-creator.git`
 
 Integration work is made in the `feature/usb_installer` branch in the
 main Tails Git repository.