docs: drop the dead GitHub Discussions links from the issue template

.github/ISSUE_TEMPLATE/config.yml

@@ -1,11 +1,14 @@
 blank_issues_enabled: false
 contact_links:
-  - name: Ask a question
-    url: https://github.com/MarketDataApp/sdk-java/discussions/new?category=q-a
-    about: Ask the community for help
-  - name: Request a feature
-    url: https://github.com/MarketDataApp/sdk-java/discussions/new?category=ideas
-    about: Share ideas for new features
+  # GitHub Discussions is not enabled on this repository, so there are
+  # deliberately no "ask a question" or "request a feature" links here — they
+  # would lead to a dead page. Questions go to the dashboard or Discord below.
   - name: Report a security issue
     url: https://github.com/MarketDataApp/sdk-java/security/policy
-    about: Learn how to notify us for sensitive bugs
+    about: Learn how to privately report a security vulnerability (do not open a public issue)
+  - name: Market Data support & community
+    url: https://www.marketdata.app/dashboard/
+    about: "Account, billing, and API questions. Community chat: https://discord.com/invite/GmdeAVRtnT"
+  - name: API documentation
+    url: https://www.marketdata.app/docs/api
+    about: Endpoint reference — check here before filing an SDK bug, since the SDK returns what the API sends