Add issue template config (#9882)

Instead of using a dummy issue template for support questions, use a issue template config.

Signed-off-by: mueller-ma <mueller-ma@users.noreply.github.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,11 @@
+blank_issues_enabled: true
+contact_links:
+  - name: 🤔 Support/Usage Question
+    url: https://community.openhab.org
+    about: Feel free to ask anything
+  - name: 📖 Documentation
+    url: https://openhab.org/addons
+    about: Official documentation
+  - name: 📚 Translation feedback
+    url: https://crowdin.com/project/openhab2-addons
+    about: Share feedback on translations