Update redirects

Author: sofietoft

13/umbraco-ui-builder/.gitbook.yaml

@@ -5,8 +5,8 @@ root: ./
     summary: SUMMARY.md
 
 redirects:
-getting-started/upgrading/README: upgrading/upgrade.md
-getting-started/upgrading/version-specific-upgrades: upgrading/version-specific.md
+getting-started/upgrading: upgrading/upgrade.md
+getting-started/upgrading/version-specific: upgrading/version-specific.md
 getting-started/installation: installation/installation.md
 getting-started/licensing-model: installation/licensing-model.md
 guides/migrating-from-konstrukt-to-umbraco-ui-builder: upgrading/migrating-from-konstrukt-to-umbraco-ui-builder.md