effbot.org is down, it's currently displaying:

> effbot.org on hiatus
>
> effbot.org is taking a break. We’ll be back, in some form or another.

But docs.python.org have a few links pointing to it, `git grep effbot` finds 11 of them in the Doc/.

I think they should be manually reviewed one by one, checking on web archive [1] if they still contain relevant information.

For example:

    Doc/library/xml.etree.elementtree.rst:See http://effbot.org/zone/element-index.htm for tutorials and links to other

The given links give Python 2 examples, so I think it's OK just to remove it.

[1]: https://web.archive.org/web/20200315142708/http://effbot.org/

@Mark, would it be at all possible for you to host the tkinter part content from Effbot on your site (as you did with the Shipman docs for #37149)? The docs have been down since mid-November and there is no indication of when they'll come back up. Since tkinter does not have very good docs on docs.python.org, this is (still) a very valuable resource.

Julien, we could remove them from docs.python.org instead of pointing to archive.org.

Users will be able to find more recent examples in the internet.

I'd argue for removing the links altogether, given the material is very outdated and from what I recall anything that was there is better covered now by TkDocs, Shipman, or other resources.