Html5Wizard: Remove it

This wizard is from a different era. Nowadays webkit is on the way
towards deprecation and the replacement isn't ready yet.

Change-Id: Ifac9a42463562fefaa4a33eb7be2a09e0d8af1aa
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>