Add TCM cluster config

Author: p7nov

doc/reference/tooling/tcm/tcm_cluster_config.rst

@@ -30,93 +30,52 @@ The configuration editor is available on the **Cluster** > **Configuration** pag
 To start managing a cluster's configuration, select this cluster in the **Cluster**
 drop-down and go to the **Configuration** page.
 
-..  _tcm_configuring_clusters_add_file:
-
-Adding a configuration file
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
 A cluster configuration in |tcm| can consist of one or multiple YAML files.
 When there are multiple files, they are all considered parts of a single cluster
 configuration. You can use this for structuring big cluster configurations.
+All cluster configuration files are listed on the left side of the **Cluster configuration** page.
 
 To add a cluster configuration file, click the plus icon (**+**) below the page title.
 
-The empty configuration file appears in the editor window on the right. Now you
-can add content to it.
-
-..  _tcm_configuring_clusters_edit_file:
-
-Editing a configuration file
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-To edit a cluster configuration file:
-
-#.  Select the cluster in the **Cluster** drop-down and go to the **Configuration** page.
-
-#.  Select the file to edit in the file list on the left.
-    It open in the interactive text editor window on the right.
-
-
-..  _tcm_configuring_clusters_download:
-
-Deleting a configuration file
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-To delete a cluster configuration file:
+To edit an existing cluster configuration file, click its name in the list.
 
-#.  Select the cluster in the **Cluster** drop-down and go to the **Configuration** page.
+To delete a cluster configuration file, click the **Delete** button beside the filename.
 
-#.  Select the file to delete in the file list on the left.
-
-#.  Click the **Delete** button beside the filename and confirm the deletion.
-    Now the file is deleted from |tcm|, but the actual configuration that the cluster
-    uses remains unchanged
-
-#.  Click **Apply** to send the changes to the configuration storage.
+To download a cluster configuration file, click the **Download** button beside the filename.
 
 .. warning::
 
-    When you apply changes after deleting a file, the corresponding configuration
-    part is *actually deleted* from the configuration storage. The can break the
-    cluster's functioning once its configuration is reloaded.
+    All configuration changes are discarded when you leave the **Cluster configuration** page.
+    :ref`Save <tcm_configuring_clusters_save>` the configuration if you want to continue
+    editing it later or :ref:`apply <tcm_configuring_clusters_apply>` it
+    to start using it on the cluster.
 
 ..  _tcm_configuring_clusters_save:
 
 Saving a configuration draft
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-
-you can either save it in |tcm| or
-send to the configuration storage and apply to the cluster.
+----------------------------
 
+|tcm| can store configurations drafts. If you want to leave an unfinished configuration
+and return to it later, save it in |tcm|. Saving applies to whole configurations:
+it records the edits of all files, file additions, and file deletions.
 
 To save a cluster configuration draft after editing, click **Save** in the **Cluster configuration** page.
 
-.. warning::
-
-    All unsaved changes are discarded when you leave the **Cluster configuration** page.
+All unsaved changes are discarded when you leave the **Cluster configuration** page.
 
-If conf
+If you have a saved configuration draft, you can reset the changes for each of its
+files individually. A reset returns the file into the state that is currently used
+by a cluster (that is, saved in the configuration storage). If you reset a newly
+added file, it is deleted.
 
 ..  _tcm_configuring_clusters_apply:
 
 Applying a configuration
-~~~~~~~~~~~~~~~~~~~~~~~~
-
-When you finish editing configuration files and the configuration is ready to use,
-apply it to the cluster.
-To apply a cluster configuration, click
-
-..  _tcm_configuring_clusters_download:
-
-Downloading a configuration
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-To download a cluster configuration file:
-
-#.  Select the cluster in the **Cluster** drop-down and go to the **Configuration** page.
+------------------------
 
-#.  Select the file to download in the file list on the left.
+When you finish editing a configuration and it's ready to use, apply the updated
+configuration to the cluster. To apply a cluster configuration, click **Apply**
+on the **Cluster configuration** page. This sends the new configuration to the cluster
+configuration storage, and it comes into effect upon the cluster configuration reload.
 
-#.  Click the **Download** button beside the filename.