HTML documentation: Add copy buttons to code blocks #35304
                
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📚 Description
A copy button is added to the top right of each code block in the HTML documentation.
Key added functionality, compared to just selecting the code and copy-pasting it to a Sage session:
# optional - ...comments) are stripped awayExample: https://deploy-preview-35304--sagemath-tobias.netlify.app/reference/discrete_geometry/sage/geometry/polyhedron/base7.html#sage.geometry.polyhedron.base7.Polyhedron_base7.volume
Resolves #35239
📝 Checklist
⌛ Dependencies