Edubuntu UI Changes

[Jonathan Carter (highvoltage)]

Dear documentation team

For those who are working on Edubuntu and related documentation, please 
take note of the following:

  * The edubuntu-live-welcome greeter is being removed since we couldn't 
complete it in time. Please don't include it in any screenshots or guides.
  * The current Ubiquity installer slideshow is an outdated one. The 
ubiquity slideshow packages are being re-built today so Edubuntu's 
slideshow should be good in tomorrow's daily build. If you see 
"Codename: Natty Narwhal" in the installer's slideshow, then you have 
the old slideshow.

Other than that we don't expect any changes or shake-ups.

Thanks!

-Jonathan