Docs: move documentation to README

[ohmyfelix]

What changed

• Moved the package documentation from .docs/README.md into the root README.md.
• Kept the Contributte badge/contact scaffold and added a short package intro.
• Moved the versions table near the top and updated the migrated debug panel image link.

Why

Refs contributte/contributte#75

Testing

• git diff --check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.93%. Comparing base (ad13e76) to head (8ef4627).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   86.93%   86.93%           
=======================================
  Files          18       18           
  Lines         222      222           
=======================================
  Hits          193      193           
  Misses         29       29           

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