chore: add link on where to get support & suggest features on issue template (#1502)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,9 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 🙏 Help and Support
+    url: https://github.com/postalhq/postal/discussions/new?category=Help-and-Support
+    about: Get friendly support from the community on Github Discussions.
+
+  - name: 🦊 Feature Suggestions
+    url: https://github.com/postalhq/postal/discussions/new?category=Feature-Suggestions
+    about: Suggest a new feature that should be added to Postal.