New documentation pages

Pages added:
Overall architectural framework
Articles
Conferences
WNoDeS Process Flow
Virtual Image
WNoDeS Workflow
Join FAQ documentation
Dropdownmenu fields modified
Typo

Legacy typo:
WNoD -> WNoDeS
Removed pages from navigation
Homepage updated

Added 2 coloumns, with link and short description for:
Cloud Integration
Dynamic Provisioning of Virtual Worker Nodes
Grid Integration
Grid Resourses through Cloud (IaaS) interfaces
Documentation page updated

Documentarion page still in progress
Releases content moved to documentation
Ignore .project