Remove the forum link (#725)

nakamura-to · web-flow · commit a07503f79302 · 2021-09-11T18:06:34.000+09:00
diff --git a/README.md b/README.md
@@ -163,11 +163,6 @@ Documentation
 
 https://doma.readthedocs.io/
 
-Forum
----------------------
-
-https://groups.google.com/g/doma-user
-
 Chatroom
 ---------------------
 
