minor symfony#44422 Use external links instead of fake issue templates (stof)

This PR was merged into the 4.4 branch.

Discussion
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Use external links instead of fake issue templates

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | n/a
| License       | MIT
| Doc PR        | n/a

GitHub now supports having external links in the issue chooser. This is better than using fake templates containing a message saying it is the wrong place to report the issue (that users might ignore)

Commits
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10b3b68 Use external links instead of fake issue templates

Author: fabpot

.github/ISSUE_TEMPLATE/3_Support_question.md

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+    - name: Support Question
+      url: https://symfony.com/support
+      about: We use GitHub issues only to discuss about Symfony bugs and new features. For this kind of questions about using Symfony or third-party bundles, please use any of the support alternatives shown in https://symfony.com/support
+    - name: Documentation Issue
+      url: https://github.com/symfony/symfony-docs/issues
+      about: Symfony Documentation has its own dedicated repository.