[feature ]Demo setup with sample workflow when running engine for the first time

[ivicac]

As a user

I want to get a demo environment with a few demo workflows when logging in for the first time

So that I can be onboard and initially be introduced to the platform and be able to play with it.

Tasks:

• [ ] Reorganize sample workflows by moving them from the codebase to bytechef-workflows repository

Acceptance Criteria TODO