[docs] remove ref to google groups -> github discussions (#11019)

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,6 +1,6 @@
 ---
-name: Feature request
-about: Suggest an idea for Ray, Tune, RLlib, etc.
+name: Feature request/Question
+about: For feature requests or questions, post on our Github Discussions page instead!
 title: ''
 labels: enhancement, triage
 assignees: ''
@@ -10,3 +10,5 @@ assignees: ''
 <!--Please include [tune], [rllib], [autoscaler] etc. in the issue title if relevant-->
 
 ### Describe your feature request
+
+For feature requests or questions, post on our Github Discussions page instead: https://github.com/ray-project/ray/discussions!

.github/ISSUE_TEMPLATE/question.md

@@ -1,14 +0,0 @@
----
-name: Question
-about: 'Ask a question about Ray usage. For possible bugs, please use the "Bug Report" template instead.'
-title: ''
-labels: question
-assignees: ''
-
----
-
-<!--Please include [tune], [rllib], [autoscaler] etc. in the issue title if relevant-->
-
-### What is your question?
-
-*Ray version and other system information (Python version, TensorFlow version, OS):*