Removing general questions and installation/setup template (#3347)

* removing general questions and installation/setup template

* Keep links Discussion and Installation

Co-authored-by: Chris Elion <celion@gmail.com>

.github/ISSUE_TEMPLATE/config.yml

 blank_issues_enabled: false
 contact_links:
+  - name: Discussion / General Questions
+    url: https://forum.unity.com/forums/ml-agents.453/
+    about: Discussion about ML-Agents, RL algorithms, or game integrations.
+  - name: Installation / Setup
+    url: https://forum.unity.com/forums/ml-agents.453/
+    about: Questions about python installation, initial connection between Unity and training, etc.
-    about: Please ask Installation / Setup and Discussion / General Questions in the Unity Forum.
+    about: Please ask other questions in the ML-Agents Unity Forum.

.github/ISSUE_TEMPLATE/discussion---general-questions.md

----
-name: Discussion / General Questions
-about: Discussion about ML-Agents, RL algorithms, or game integrations
-title: ''
-labels: discussion
-assignees: ''
-
----
-
-For discussions, please post in [ML-Agents Unity Forum](https://forum.unity.com/forums/ml-agents.453/) instead of
-creating a Github issue. Unity forums are the predominant community for Unity users and experts. By leveraging Unity
-forums for general discussions and project help, we can keep Github issues for bugs, performance issues, and feature
-requests for ML-Agents.
-
-
-**Note**: The ML-Agents team has limited resources for education and community discussion.  We'll participate as we are
-able, but encourage members of the community to support one another to discuss and support one another.

.github/ISSUE_TEMPLATE/discussion---installation-and-setup.md

----
-name: Installation / Setup
-about: Questions about python installation, initial connection between Unity and training, etc.
-title: ''
-labels: installation
-assignees: ''
-
----
-
-For installation and initial setup questions, please post in [ML-Agents Unity Forum](https://forum.unity.com/forums/ml-agents.453/)
-instead of creating a Github issue. Include steps to reproduce, error logs, and any other relevant information about
-your versions and platform.