Restructured front page into logical documentation sections, with speculative chapter names.
Restructured front page into logical documentation sections, with speculative chapter names.

ecohealthalliance/tangelo,Kitware/tangelo,mathstuf/tangelo,ecohealthalliance/tangelo,aashish24/tangelo,mathstuf/tangelo,ecohealthalliance/tangelo,mathstuf/tangelo,Kitware/tangelo,Kitware/tangelo,aashish24/tangelo,aashish24/tangelo