Update config.yml

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,8 @@
 blank_issues_enabled: false
 contact_links:
+  - name: Mobile Application Issues
+    url: https://github.com/pixelfed/pixelfed-rn/issues
+    about: Please create issues in the mobile app repo.
   - name: Question
     url: https://discord.gg/6Fy6AJMbMU
     about: Please ask and answer questions in our Discord server