SDK project pages now under sdk directory
Distinguish between SDK and non-SDK projects when updating docs
Latest content updates
Sidebar should link to releases page on GitHub
Update project timestamps
Update buttons on add-on pages
 - No more distinction between different upload types
 - Add View on Add-ons button
Update script now reads existing YAML data before applying new values,
and updates/adds as appropriate
 - Fixes issue where additional fields not explictly specified would be
removed when the script was run
Fix username and password prompts
Fix links from Add-ons page
Add addons.alfresco.com URLs
Remove duplicated SDK projects
Navbar no longer has fixed position, instead moves as the user scrolls