Update SUMMARY.md

Author: madsrasmussen

17/umbraco-cms/SUMMARY.md

@@ -212,7 +212,12 @@
   * [Context API](customizing/foundation/context-api/README.md)
     * [Consume a Context](customizing/foundation/context-api/consume-a-context.md)
     * [Provide a Context](customizing/foundation/context-api/provide-a-context.md)
-  * [Repositories](customizing/foundation/repositories.md)
+  * [Repositories](customizing/foundation/repositories/README.md)
+    * [Repository Types](customizing/foundation/repositories/repository-types/README.md)
+      * [Collection Repository](customizing/foundation/repositories/repository-types/collection-repository.md)
+      * [Detail Repository](customizing/foundation/repositories/repository-types/detail-repository.md)
+      * [Item Repository](customizing/foundation/repositories/repository-types/item-repository.md)
+      * [Tree Repository](customizing/foundation/repositories/repository-types/tree-repository.md)
   * [States](customizing/foundation/states.md)
   * [UI Sorting](customizing/foundation/sorting.md)
   * [Routes](customizing/foundation/routes.md)