GitHub: Add link to forum when adding new issue (#20798)

* GitHub: Add link to forum when adding new issue

* removed question template

* Moved to correct folder

.github/ISSUE_TEMPLATE/4-question.md

----
-name: Support request
-about: 'Question or support request relating to using Grafana'
-title: ''
-labels: ''
-assignees: ''
----
-
-STOP -- PLEASE READ!
-
-GitHub is not the right place for questions and support requests.
-
-Please ask questions on our community site: [https://community.grafana.com/](https://community.grafana.com/)
-

.github/ISSUE_TEMPLATE/config.yaml

+blank_issues_enabled: false
+contact_links:
+  - name: Questions & Help
+    url: https://community.grafana.com
+    about: Please ask and answer questions here.