[Feature Request]: Katas need new platform/host

### What would you like to happen?

Katas are currently hosted via Stepik. Stepik is no longer supported by IntelliJ/Jetbrains-Suite [ well by the 'new' Jetbrains Academy Plugin ]. Therefore for Katas to work, we need a new course host. There are some options. Someone needs to upload. AND, update docs to point to new location.

See --> https://blog.jetbrains.com/education/2023/03/30/jetbrains-academy-plugin-2023-3-is-available/
and
https://github.com/apache/beam/tree/master/learning/katas
etc.

### Issue Priority

Priority: 3 (nice-to-have improvement)

### Issue Components

- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [X] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner

Start by reviewing the existing materials under learning/katas and the linked JetBrains announcement to understand the Stepik dependency and available hosting options. The work is done when a new course host is selected, the katas are uploaded there, and documentation points to the new location.

Written by the indexing model from the issue text.