Doc restructuring

docs/en_US/managing_cluster_objects.rst

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+.. _managing_cluster_objects:
+
+******************************
+Managing Cluster Level Objects 
+******************************
+   
+Some object definitions reside at the cluster level; pgAdmin 4 provides dialogs that allow you to create these objects, manage them, and control their relationships to each other.  To access a dialog that allows you to create a database object, right-click on the object type in the pgAdmin tree control, and select the *Create* option for that object.  For example, to create a new database, right-click on the *Databases* node, and select *Create Database...*    
+   
+Contents:
+
+.. toctree::
+
+   database_dialog
+   move_objects
+   resource_group_dialog
+   role_dialog
+   tablespace_dialog