Remove Google groups. Closes #14912.

docs/markdown/index.md

diff --git a/docs/markdown/index.md b/docs/markdown/index.md
index cbb7901..ea168c2 100644
--- a/docs/markdown/index.md
+++ b/docs/markdown/index.md
@@ -51,9 +51,7 @@
 interface](https://app.element.io/#/room/#mesonbuild:matrix.org)) or
 [OFTC IRC](https://www.oftc.net/).
 
-Other methods of communication include the [mailing
-list](https://groups.google.com/forum/#!forum/mesonbuild) (hosted by
-Google Groups) and the
+For general discussion, please use the
 [Discussions](https://github.com/mesonbuild/meson/discussions) section
 of the Meson GitHub repository.