docs(rook-ceph): update backstage documentation

.backstage/components/rook-ceph/docs/index.md

@@ -1,16 +1,30 @@
 # rook-ceph
 
-## something
+## overview
 
-## something else
+The `rook-ceph` component is a storage operator for Kubernetes, leveraging the power of Ceph, a highly scalable and resilient storage system.
+It abstracts the complexity of deploying and managing Ceph storage clusters, making it easy to provision, scale, and maintain Ceph within your Kubernetes environment.
+With `rook-ceph`, you can leverage Ceph's capabilities for object storage, block storage, and file systems in a cloud-native way.
+It provides seamless integration with Kubernetes, allowing you to use standard Kubernetes primitives for managing storage.
+This component is part of Rook, an open-source cloud-native storage orchestrator, providing the platform, framework, and support for a diverse set of storage solutions to natively integrate with cloud-native environments.
 
-??? success
-Content.
+## setup
 
-??? warning classes
-Content.
+Setting up `rook-ceph` involves a few steps to ensure a successful deployment on your Kubernetes cluster.
 
-```plantuml id="myDiag" format="png" classes="uml myDiagram" alt="My super diagram placeholder" title="My super diagram" width="300px" height="300px"
-  Goofy ->  MickeyMouse: calls
-  Goofy <-- MickeyMouse: responds
-```
+First, you need to install the Rook operator. This can be done by applying the Rook operator manifest using `kubectl`.
+
+Next, you need to create a Rook cluster. This involves defining a `CephCluster` resource in a YAML file, specifying the desired configuration for your Ceph storage cluster.
+
+Once the Rook operator and the Ceph cluster are up and running, you can start provisioning storage.
+Rook allows you to define `CephBlockPool`, `CephFilesystem`, and `CephObjectStore` resources to create block devices, file systems, and S3-compatible object stores, respectively.
+
+Remember to monitor the status of your `rook-ceph` deployment regularly. You can use the `ceph status` command for this purpose.
+
+Detailed instructions and examples can be found in the official Rook documentation. Always ensure your Kubernetes environment meets the prerequisites before starting the setup.
+
+## usage
+
+Using `rook-ceph` involves interacting with the storage resources it provides.
+
+For block storage, you can create a PersistentVolumeClaim against a StorageClass that uses the `rook-ceph-block` provisioner. This will dynamically provision a PersistentVolume backed by a Rook Ceph block device.