While good points are made below, I know in my case (and probably Max's as well), the character limit in the detailed description would likely be exceeded if we put our entire project proposal in the Google application.  That being said, if I can still edit it, I might put at least the general "about me" stuff into the Google application as a start.  Also note that the detailed description is supposedly never made public, but is available to mentors.

Gail

Thorsten Wilms wrote: 
If I were them, I would be very annoyed of applications that just link 
to web pages. I think it's an important aspect of such an application 
that it is finished, done, fixed, defined on deadline. A projects 
goals and ideas may have to be redefined, but you need at least 
a snapshot for evaluation, which should be archived. Later on you 
can go back and see how the project started ...

Including actual content you need to have anyway in the application 
is easy. Not doing so means taking an entirely unnecessary risk.