We're now at 3.5 level:

- Fixed changed filenames and topic titles
- Removed links to obsolete pages
- Added links to new pages

Task-number: QTBUG-47901
Change-Id: I3393555c86bf3cf58770f230e7a9c7fd7e258476
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>