Add Python Intro - only the necessary stuff

[manykarim]

Similar to the previous Python Getting Started Guide for RF

robotframework/robotframework@55fe890#diff-e5d05d88c130bc9dce4a84dbd964151e7695a17720759c8f155d5d54c7a1ed96

[manykarim]

Maybe we can use ChatGPT for the basics

[pekkaklarck]

Last version of the old Python tutorial can be found here:
https://github.com/robotframework/robotframework/tree/v3.1.2/doc/python

We probably could use it as a base for a new very short Python intro. Main things to do would include:

• Upgrade examples to Python 3.
• Update "more info" links to point to some other resource than Dive Into Python that unfortunately doesn't exist anymore.
• Explain type hints in high level. They are convenient with automatic argument conversion.