Refactor README

[LimitlessGreen]

The Readme has grown a lot, and now it's time to go from Markdown to Asciidoc for the following reasons:

• Automatic Table of Contents
• Automatic numbering
• Warning and Info Boxes
• Customization parameters
• Advanced table design

I did the following changes:

• converted the Markdown in Asciidoc with kramdoc
• Added automatic ToC
• Added automatic chapter numbers
• Reformatted the About section
• Added INFO, TIP and WARNING boxes
• Added syntax highlighting for some Sh, Json and Python parts
• Centered the first badges (and found a little HTML "hack")
• Added social badges

Known bugs:

• Double dash in E-Mail

Additional information:

• It seems badgen.net is no longer under active development. Maybe change completely to shields.io
• Asciidoc also supports bibliography

[Josef-Haupt]

Hi thanks for your work! I've never used AsciiDoc but willing to learn new technologies.
I'm definitly not against it, but there are some stylistic choices in your port that I would like to change before accepting the PR.
So I'm going to look into AsciiDoc in the coming days and update your branch with some changes.

[Josef-Haupt]

• moved the contact buttons to the top
• simplified some links with a shared variable
• Set autowidth for the community projects table
• Added alt text for each image in the community projects table and a forced width of 300 pixels
• Removed outdated section about a run.bat (no idea where to find it)
• used explicit code block syntax
• Changed required Pyhton version to 3.9 and up

@kahst Please have a look, feedback would be appreciated

[kahst]

Looks good, I like the updated style.

[LimitlessGreen]

Nice, I like the updated style too and the place for the social badges on top is much better. I not completely like the about section, though (but I'm fine with it). And maybe delete the old README.md file to stop confusion 😅