Note that the color changed to a darker purple. Our color palette in the Furo theme only has the darker color of purple available, so this is acceptable.
The icon is also a little smaller. I didn't spend much time trying to get the original size because the new size seems fine and this custom directive is not widely used.
Closes https://github.com/Qiskit/qiskit_sphinx_theme/issues/433. This is mainly to reduce tech debt.
Note that the color changed to a darker purple. Our color palette in the Furo theme only has the darker color of purple available, so this is acceptable.
The icon is also a little smaller. I didn't spend much time trying to get the original size because the new size seems fine and this custom directive is not widely used.