Firest draft of the "How to Organize Configuration Files" cookbook
[2.3] Examples that points to the DataCollectorListener should be removed.
Replaced the "Hello World" example to avoid confusion with AcmeDemoBundle
use a placeholder for the constructor arguments
Reworded the beginning of one section
Added all the suggestions made by reviewers
Replaced "AcmeWebsiteBundle" by "AcmeDemoBundle"
Added the latest suggestions made by reviewers
Fixed the link to another cookbook article
Added suggestions made by @cordoval
Fixed the target of one cookbook article link
Removed the "Directory Loading" section because it doesn't work out of the box
Added more suggestions made by @xabbuh
Removed redundant configuration blocks
Added a note for users with an existing AcmeDemoBundle
[Security] Added remote_user firewall info and documentation for pre authenticated firewalls
[Reference][Configuration] Removed version added for remote_user
rebased using x509 pr, added remote_user pre authenticated part
fix missing backtick, rephrased bottom note
Updated docs for Monolog "swift" handler in cookbook.