Rename references to the discourse forum

.github/ISSUE_TEMPLATE/config.yml

@@ -1,7 +1,7 @@
 blank_issues_enabled: false
 contact_links:
   - name: Discourse forum for bitwarden_rs
-    url: https://bitwardenrs.discourse.group/
+    url: https://vaultwarden.discourse.group/
     about: Use this forum to request features or get help with usage/configuration.
   - name: GitHub Discussions for vaultwarden
     url: https://github.com/dani-garcia/vaultwarden/discussions