[doc] rewrite documentation introduction
[doc] it is released on pypi
[doc] add TODO comments
[doc] remove useless stuff
[doc] match reality
[doc] be closer to reality
[doc] fix example
[doc] add another § on .help()
[doc] make example more obvious
[doc] fix examples
[doc] fix examples, '?' magic syntax doesn't work in examples
[doc] better example
[doc] I have actually written a page on every nodes now
[doc] big rewrite of the modifying page
[doc] add code block modifications
[doc] example syntaxe fail