ISSUE_TEMPLATE changes (#62904)

.github/ISSUE_TEMPLATE/SUPPORT.md

----
-name: I want help writing my application
-about: You have a question for how to achieve a particular effect, or you need help
-  with using a particular API.
-title: ''
-labels: 'created via support template'
-assignees: ''
-
----
-
-<!-- Thank you for using Flutter!
-
-     Please check out our documentation first:
-      * https://flutter.dev/
-      * https://api.flutter.dev/
-
-     If you can't find the answer there, please consider asking a question on
-     the Stack Overflow Web site:
-      * https://stackoverflow.com/questions/tagged/flutter?sort=frequent
-
-     Please don't file a GitHub issue for support requests. GitHub issues are
-     for tracking defects in the product. If you file a bug asking for help, we
-     will consider this a request for a documentation update.
-
--->

.github/ISSUE_TEMPLATE/config.yml

+blank_issues_enabled: false
+contact_links:
+  - name: I want help writing my application
+    url: https://stackoverflow.com/tags/flutter
+    about: Ask your questions about how to achieve a particular effect in Flutter or get help with using a particular API.
\ No newline at end of file