[TASK][DOC] Move FAQ next to the introduction chapter

Change-Id: I6b9781cf73775956bb695df1828b4498d0a71613
Reviewed-on: http://review.typo3.org/32263
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>