Update pattern discussion URL

Author: lesliecdubs

.github/ISSUE_TEMPLATE/config.yml

@@ -1,6 +1,6 @@
 contact_links:
   - name: Propose an idea for a new component
-    url: https://github.com/github/primer/issues/new?assignees=&labels=needs+triage&template=01-request.md&title=%5BProposal%5D+
+    url: https://github.com/github/primer/discussions/categories/design-patterns
     about: If you'd like to propose a new Primer pattern, big or small, let's talk! The best way to get started, especially if your proposal is in its early stages, is to open a pattern proposal (GitHub staff only).
   - name: Request a new pattern
     url: https://github.com/github/primer/issues/new?assignees=&labels=needs+triage&template=01-request.md&title=%5BProposal%5D+