docs: update maintainer to me in catalog-info.yaml

https://discuss.openedx.org/t/frontend-app-authoring-maintanership-transfer/15786

Author: bradenmacdonald

catalog-info.yaml

@@ -14,6 +14,6 @@ metadata:
     openedx.org/arch-interest-groups: ""
     openedx.org/release: "master"
 spec:
-  owner: group:2u-tnl
+  owner: user:bradenmacdonald
   type: 'website'
   lifecycle: 'production'