Add language and product logos

[tony]

Add the Python-colored workspace mark to the README and center its title, introduction, and badges. The rest of the README keeps its existing alignment.

The artwork includes SVG and transparent 512px PNG files, plus a repository social preview image.

Validation

• SVG and PNG bytes match the reviewed logo kit, and README image paths resolve.
• GitHub and PyPI Markdown renderers keep the title and introduction centered, with the body outside the centered header.
• Wheel metadata and the source archive preserve the README exactly.
• Executable examples are unchanged. Direct read-only review-agent review found no actionable issues, and git diff --check passes.

This PR remains open for the maintainer to merge.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.55%. Comparing base (3153371) to head (754ae5f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1087   +/-   ##
=======================================
  Coverage   82.55%   82.55%           
=======================================
  Files          31       31           
  Lines        2768     2768           
  Branches      518      518           
=======================================
  Hits         2285     2285           
  Misses        346      346           
  Partials      137      137           

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