Vague description of AWM

Issue 1: AWM is not explained properly in beginner terms anywhere in its creation process.

Issue 2: No link to documentation anywhere in the creation process.

Proposal: Rewrite description on the Create your own AWM homepage & include a link to documentation:

"Create collaborative web applications. Define the kind of data that will be used and presented to your users. You can also set an icon and a description for your app. Learn more."

Forum discussion: https://forum.xwiki.org/t/better-explanation-of-awm/15921