Fixes in qdocconf

- Don't make the Virtual Keyboard doc part of Qt's
- Update path to examples
- Add navigation pages
- Give the project its own version
- Add "standard" doc include
- Make doc for DeclarativeInputContext internal
- Move code snippets folder

Change-Id: Ib46e27bd6dd70225583d75cf5567d65a11cfaa2e
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>