[drupal-docs] Handbook footer

[Gabor Hojtsy]

> It could also be a block, but a footer is the most intuitive.
> 
> So, can someone add this into the theme?  If this is just Drupal.org, 
> then I guess that involves Steven, if it is for all themes, then ...  
> Adrian for phptemplate engine?  Not the *slightest* clue how that would 
> work.  ^.^  It is critical, however.

Since this depends on the intent of the book written, this clearly 
belongs to drupal.org only for now.

Goba