Point feature requests to GitHub discussions (#3511)

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,8 @@
 blank_issues_enabled: true
 contact_links:
+  - name: Feature Request
+    url: https://github.com/Kong/insomnia/discussions/categories/ideas
+    about: Search and submit ideas for this project
   - name: Question
     url: https://chat.insomnia.rest/
     about: Please ask and answer questions about Insomnia in our Slack Community