Add textual representation of the image in the documentation for accessibility reasons.

Author: soenkeliebau

docs/modules/demos/pages/end-to-end-security.adoc

@@ -5,20 +5,26 @@
 This is a demo to showcase what can be done with Open Policy Agent around authorization in the Stackable Data Platform.
 It covers the following aspects of security:
 
-* Column- and row-level filtering
-* OIDC support across the board
-* Kerberos on Kubernetes
-* Keycloak and flexible group lookup
-* Open Policy Agent for the utmost flexibility in building access rules
 
-across this tech stack:
 
-* Trino
-* Superset
-* HDFS
-
-
-Install this demo on an existing Kubernetes cluster:
+This demo will:
+
+* Install the Stackable operators
+* Spin up the following data products
+** *Trino*: A fast distributed SQL query engine for big data analytics that helps you explore your data universe. This demo uses it to enable SQL access to the data.
+** *Spark*: A multi-language engine for executing data engineering, data science, and machine learning. This demo uses it to batch-process data from S3 by training and scoring an unsupervised anomaly detection model and writing the results into a Trino table. Spark uses an isolation forest algorithm from the scikit-learn machine learning library in this demo.
+** *HDFS*: A distributed file system that is designed to scale up from single servers to thousands of machines, each offering local computation and storage.
+** *Hive metastore*: A service that stores metadata related to Apache Hive and other services. This demo uses it as metadata storage for Trino and Spark.
+** *Open policy agent (OPA)*: An open-source, general-purpose policy engine unifies policy enforcement across the stack. This demo uses it as the authorizer for Trino, which decides which user can query which data.
+** *Superset*: A modern data exploration and visualization platform. This demo utilizes Superset to retrieve data from Trino via SQL queries and build dashboards on top of that data.
+* Configure security to showcase the following features
+** Column- and row-level filtering
+** OIDC support across the board
+** Kerberos on Kubernetes
+** Keycloak and flexible group lookup
+** Open Policy Agent for the utmost flexibility in building access rules
+
+The following figure gives an overview of how the components interact with each other:
 
 [source,console]
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