[docs][Snackbar] Stop recommending the usage of notistack, the library is seemingly no longer (properly) maintained

Related page

https://mui.com/material-ui/react-snackbar/

Kind of issue

Other

Issue description

The current documentation page for react-snackbar mentions notistack for third-party integrations. However, the author of the notistack seems to have gone MIA with an ever-piling stack of unaddressed issues and PRs. I also created an issue querying if the project is still maintained, which thus far has gone unanswered: https://github.com/iamhosseindhv/notistack/issues/602.

It would be best for MUI to stop directing people to use an unmaintained library as that is asking for trouble sooner or later.

Context

Notistack should be removed from third-party integrations on the relevant page, and the whole block should be removed as it is the last one remaining. Possibly the documentation could link to contemporary projects such as react-toastify. A project like react-toastify does not use MUI, but it is a good alternative to achieve stateful imperative snackbar API.

Search keywords: notistack, snackbar

Open the related Material UI Snackbar documentation page and find the third-party integrations block mentioning notistack. Remove that recommendation and the remaining block, then verify that the page no longer directs readers to notistack; consider whether an alternative link is appropriate as described in the issue.