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I removed the Qt SDK 1.1 and some other outdated videos.
I added new videos from Qt Developer Days 2011/2012.
I also had to add icons new for Developer Days 2011/2012.

Removed videos:
Qt Creator! Getting the most...
Qt Quick Components
SDK 1.1 videos

New videos:
2012
What's New in QtWebKit in 5.0
Creator 101
Qt 5 Roadmap
QML Coding, Performance and Debugging: Usage of Tools

2011
Qt and Qt Quick
Qt Quick Best Practices and Design Patterns
What’s new in QtQuick 2.0


Task-number: QTCREATORBUG-8432
Change-Id: I5cf2a981d156a6825cda97e9bc7729b73c7350da
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>