Remove tutorial

[phoe]

The default emacs tutorial is confusing, since it refers to keybindings that are modified (for example, M-x being bound to execute-extended-command). One newcomer to Lisp has fallen in that hole today.

I suggest replacing the whole tutorial file with something that in the very least is not confusing to newcomers (e.g. an empty file, or a file linking to #lisp and #clschool on Freenode or the Lisp Discord server).

[Shinmera]

I think a good option would be to make whatever opens the tutorial open the portacle help buffer instead

[phoe]

Seems like the elisp function help-with-tutorial should be redefined.

https://github.com/emacs-mirror/emacs/blob/d0e2a341dd9a9a365fd311748df024ecb25b70ec/lisp/tutorial.el#L736