Merge pull request matplotlib#24748 from tacaswell/doc/remove_research_notice

DOC: remove research notice

Author: rcomer

README.md

@@ -72,18 +72,3 @@ acknowledge this by citing Matplotlib.
 [A ready-made citation
 entry](https://matplotlib.org/stable/users/project/citing.html) is
 available.
-
-### Research notice
-
-Please note that this repository is participating in a study into
-sustainability of open source projects. Data will be gathered about this
-repository for approximately the next 12 months, starting from June
-2021.
-
-Data collected will include number of contributors, number of PRs, time
-taken to close/merge these PRs, and issues closed.
-
-For more information, please visit [the informational
-page](https://sustainable-open-science-and-software.github.io/) or
-download the [participant information
-sheet](https://sustainable-open-science-and-software.github.io/assets/PIS_sustainable_software.pdf).