Update README.md

Author: soenkeliebau

README.md

@@ -1,8 +1,12 @@
-# spark-k8s-operator
+# Stackable Operator for Apache Spark
 
-[![Build Actions Status](https://ci.stackable.tech/job/Spark%20k8s%20Operator%20Integration%20Tests/badge/icon?subject=Integration%20Tests)](https://ci.stackable.tech/job/Spark%20k8s%20Operator%20Integration%20Tests)
+[![Build Actions Status](https://ci.stackable.tech/job/spark%2dk8s%2doperator%2dit%2dnightly/badge/icon?subject=Integration%20Tests)](https://ci.stackable.tech/job/spark%2dk8s%2doperator%2dit%2dnightly)
+[![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)](https://github.com/stackabletech/spark-k8s-operator/graphs/commit-activity)
 
-Operator for Apache Spark-on-Kubernetes for the Stackable Data Platform.
+This is a Kubernetes Operator to manage [Apache Spark](https://spark.apache.org/) jobs.
 
-The docs can be found in the `docs` subdirectory, and they are published together with docs for all other Stackable products at https://docs.stackable.tech.
+It is written by [Stackable](https://www.stackable.tech) in Rust.
 
+The documentation for this operator can be found at <https://docs.stackable.tech/spark-k8s/stable/index.html>.
+
+The documentation for all Stackable products can be found at <https://docs.stackable.tech](https://docs.stackable.tech>.