Improve Hello-World maven Quickstart to not restart and have CrashLoopBackOffs about jkube HOT 4 CLOSED

A very simple Java 21 HttpServer with a single endpoint should do the job.

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I can work on this

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@waynemorphic : Yes, I would appreciate this. Let me try to explain what needs to be done here.

1. Remove class printing Hello World message App
2. Use Java's inbuilt HttpServer class to create a simple HTTP server that will print some simple message at / endpoint. I remember I had tried something similar a few years ago in https://github.com/rohankanojia-forks/eclipse-jkube-demo-simple-http-server (See HttpServerApplication) . Maybe you need to tweak some things to get the desired result.
3. Update README of quickstart with respect to new changes
4. Update project README https://github.com/eclipse/jkube/tree/master?tab=readme-ov-file#hello-world-using-eclipse-jkube

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Java 21 provides an extremely easy way to create webserver with a 2 or 3 liner code.
Just look for that online. We just need an endpoint that prints a message.

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