Build a GUI for launching demos

_This is one of the ideas for future development I have. No final assignment yet, just a subject to talk about it and possibly bring some good ideas together. I am looking forward to hear your feedback or thoughts._

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This is wild idea. As you can see, currently the demo suite is a command line program - you launch it in terminal, it prints out something.

In #268, #270, #271 and #272 we discuss ways of configuring it.

But in my thoughts, it should get even better - the program should start as an app with GUI (I guess a website makes best sense nowadays, not a proprietary desktop application), user should pick what demos to run, where to store the output, and re-launch the suite based on his selection on demand.

I haven't thought about this any more yet, so the field is open for ideas.

My secret favorite would be some solution involving [Vaadin Flow](https://vaadin.com/flow), but maybe someone know better? I would prefer to stay in Java Ecosystem though...