Update getting started to reference 3.0.4-GA version of the workspace
Temporarily change the workspace version to 3.0.3-GA because of critical bug in 3.0.4-GA
Update workspace download to latest 3.0 GA
New Javadoc link syntax
update javadoc syntax
update module docs
Reorganizes document 

Added a better description to commercial modules.
Remove module documentation
Create Broadleaf-Data-Upgrade-Process
Update _sidebar.md

Removed link to internal docs for module extensions
Update _index.md
Fixed links to most external modules
Update workspace version to latest 3.0 GA
Update Getting-Started.md

Remove reference to GWT
Add admin custom controller documentation
Remove extraneous module docs folder in database model because those models are managed in each individual module doc
Test modification to reference new javadoc link style
Revert "Test modification to reference new javadoc link style"

This reverts commit c9c11b83dfaad234e664e43428c8213e36cb2c71.
Test javadoc link update
Update all javadoc links to conform to the new syntax