Update issue template config [skip ci]

Author: JimBobSquarePants

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +1,8 @@
 blank_issues_enabled: false
 contact_links:
     - name: Ask a Question
-      url: https://github.com/SixLabors/ImageSharp/discussions/new?category_id=6331980
+      url: https://github.com/SixLabors/ImageSharp.Web/discussions/new?category=q-a
       about: Ask a question about this project.
     - name: Feature Request
-      url: https://github.com/SixLabors/ImageSharp/discussions/new?category_id=6331981
+      url: https://github.com/SixLabors/ImageSharp.Web/discussions/new?category=show-and-tell
       about: Share ideas for new features for this project.