Link some doc chapters at higher levels on the project site

On the main Narayana site (http://narayana.io) we call out the higher level components such as JTA, STM, Orb Portability etc. However, on the docs page (http://narayana.io/documentation/index.html), apart from Blacktie the reader needs to load and read through the entire doc (or manually search) for the relevant sections. Maybe link the relevant chapters (such as http://narayana.io/docs/project/index.html#d0e16062) in the docs pages and/or the top level of the site, so someone looking for the JTS or STM docs can click there immediately.