Direct support requests to the forums

This disables the default issue type in Gitea and replaces it with a
link to the help and feedback section in the forums. That's a measure to
discourage players to use Gitea as a tool to seek support.

.gitea/ISSUE_TEMPLATE/config.yaml

@@ -0,0 +1,7 @@
+---
+blank_issues_enabled: false
+contact_links:
+  - name: Help & Feedback
+    url: https://wildfiregames.com/forum/forum/145-help-amp-feedback/
+    about: >
+      If you need help or have feedback, please open a thread in the forums.