There is no update to iLife. iLife 11 was the last update to iLife and the boxed set contains iWeb 09 which is the latest and last version of iWeb.
iWeb and iDVD don't ship on new Macs and have not done so for several months now. Apple also withdrew support for and stopped selling iWeb several months ago in the run up to MobileMe going and being replaced with iCloud that does not offer web hosting.
If you have iWeb on your Mac you can still use it to create websites, but you'll need to upload them to a new server.
There are plenty of alternative web creation apps that you can look at and lots of them for sale in the Mac App Store too.
Have a look at RapidWeaver, Sandvox, Freeway Pro/Express and Flux 4. There are others such as Goldfish and then the Content Management Systems such as Drupal, Joomla and WordPress.org that can be loaded onto a server with one click and you don't need to know anything about coding to use these.
You can download free trials of most before deciding which one you want to purcahse.