Release new version (2.1.0)

All changes :
- Change the name of the launcher ("FTB" to "FTNT")
- Change images
- Change locations
- Change news system (remove RSS, return to HTML)
- Remove "Pack codes" button
- Move buttons
- Remove "CreeperHost" and "Tug" buttons
- Change download location
- Change install directory
- Change author for official modpacks
- Update with the lastest version

That's all ! :)