Documentation for version 6

[arhimede]

Feature Request

Q	A
New Feature	yes
RFC	no
BC Break	yes

Summary

add documentation for version 6 that will be released

[alexmerlin]

@arhimede Where will these new docs be placed in docs/book/v6/? Some new folder?

[arhimede]

@arhimede Where will these new docs be placed in docs/book/v6/? Some new folder?

If not under "core features", maybe under a new folder like "extended features"

[arhimede]

Anyway i imagine that once every 3 month we will need to re-organize the documentation to keep up with new stuff